diff --git a/assets/css/misuzu/profile/forum-activity.css b/assets/css/misuzu/profile/forum-activity.css
new file mode 100644
index 00000000..7d90da77
--- /dev/null
+++ b/assets/css/misuzu/profile/forum-activity.css
@@ -0,0 +1,24 @@
+.profile__forum-activity__content {
+    margin: 5px;
+}
+
+.profile__forum-activity__topic {
+    margin-top: 5px;
+}
+
+.profile__forum-activity__leader {
+    font-size: .9em;
+    margin: 0 5px;
+}
+
+.profile__forum-activity .forum__category__icon {
+    width: 30px;
+    height: 30px;
+    font-size: 1.5em;
+    line-height: 1.5em;
+    flex: 0 0 30px;
+}
+
+.profile__forum-activity .forum__category {
+    background-color: rgba(17, 17, 17, .6);
+}
diff --git a/public/profile.php b/public/profile.php
index 669ecca1..a35260e7 100644
--- a/public/profile.php
+++ b/public/profile.php
@@ -353,10 +353,20 @@ switch($profileMode) {
         $template = 'profile.index';
         $warnings = $profileUser->getProfileWarnings($currentUser);
 
+        $activeCategoryStats = $viewingAsGuest ? null : forum_get_user_most_active_category_info($profileUser->getId());
+        $activeCategoryInfo = empty($activeCategoryStats->forum_id) ? null : forum_get($activeCategoryStats->forum_id);
+
+        $activeTopicStats = $viewingAsGuest ? null : forum_get_user_most_active_topic_info($profileUser->getId());
+        $activeTopicInfo = empty($activeTopicStats->topic_id) ? null : forum_topic_get($activeTopicStats->topic_id);
+
         Template::set([
             'profile_warnings' => $warnings,
             'profile_warnings_view_private' => $canManageWarnings,
             'profile_warnings_can_manage' => $canManageWarnings,
+            'profile_active_category_stats' => $activeCategoryStats,
+            'profile_active_category_info' => $activeCategoryInfo,
+            'profile_active_topic_stats' => $activeTopicStats,
+            'profile_active_topic_info' => $activeTopicInfo,
         ]);
         break;
 }
diff --git a/src/Forum/forum.php b/src/Forum/forum.php
index 46fadb2f..9cf82f88 100644
--- a/src/Forum/forum.php
+++ b/src/Forum/forum.php
@@ -526,3 +526,18 @@ function forum_count_synchronise(int $forumId = MSZ_FORUM_ROOT, bool $save = tru
 
     return compact('topics', 'posts');
 }
+
+function forum_get_user_most_active_category_info(int $userId): ?object {
+    if($userId < 1)
+        return null;
+
+    global $cfg;
+
+    $getActiveForum = \Misuzu\DB::prepare(sprintf(
+        'SELECT forum_id, COUNT(*) AS post_count FROM msz_forum_posts WHERE user_id = :user AND post_deleted IS NULL AND forum_id NOT IN (%s) GROUP BY forum_id ORDER BY post_count DESC LIMIT 1',
+        implode(',', $cfg->getValue('forum_leader.unranked.forum', \Misuzu\Config\IConfig::T_ARR))
+    ));
+    $getActiveForum->bind('user', $userId);
+
+    return $getActiveForum->fetchObject();
+}
diff --git a/src/Forum/topic.php b/src/Forum/topic.php
index 989059ab..181998ae 100644
--- a/src/Forum/topic.php
+++ b/src/Forum/topic.php
@@ -652,3 +652,18 @@ function forum_topic_nuke(int $topicId): bool {
     $nukeTopic->bind('topic', $topicId);
     return $nukeTopic->execute();
 }
+
+function forum_get_user_most_active_topic_info(int $userId): ?object {
+    if($userId < 1)
+        return null;
+
+    global $cfg;
+
+    $getActiveForum = \Misuzu\DB::prepare(sprintf(
+        'SELECT topic_id, COUNT(*) AS post_count FROM msz_forum_posts WHERE user_id = :user AND post_deleted IS NULL AND forum_id NOT IN (%s) GROUP BY topic_id ORDER BY post_count DESC LIMIT 1',
+        implode(',', $cfg->getValue('forum_leader.unranked.forum', \Misuzu\Config\IConfig::T_ARR))
+    ));
+    $getActiveForum->bind('user', $userId);
+
+    return $getActiveForum->fetchObject();
+}
diff --git a/templates/profile/index.twig b/templates/profile/index.twig
index 2b5f87e7..b2cad28d 100644
--- a/templates/profile/index.twig
+++ b/templates/profile/index.twig
@@ -81,7 +81,8 @@
                 {% set show_profile_fields = profile_is_editing ? perms.edit_profile : profile_fields|length > 0 %}
                 {% set show_background_settings = profile_is_editing and perms.edit_background %}
                 {% set show_birthdate = profile_is_editing and perms.edit_birthdate %}
-                {% set show_sidebar = show_profile_fields or show_background_settings %}
+                {% set show_active_forum_info = not profile_is_editing and (profile_active_category_info.forum_id|default(0) > 0 or profile_active_topic_info.topic_id|default(0) > 0) %}
+                {% set show_sidebar = show_profile_fields or show_background_settings or show_birthdate or show_active_forum_info %}
 
                 {% if show_sidebar %}
                     <div class="profile__content__side">
@@ -136,6 +137,102 @@
                                 </div>
                             </div>
                         {% endif %}
+                        {% if show_active_forum_info %}
+                            <div class="container profile__container profile__forum-activity">
+                                {{ container_title('Forum Activity') }}
+
+                                <div class="profile__forum-activity__content">
+                                {% if profile_active_category_info is not empty %}
+                                    <div class="profile__forum-activity__category">
+                                        {% set forum = profile_active_category_info %}
+                                        {% if forum.forum_icon is defined and forum.forum_icon is not empty %}
+                                            {% set forum_icon = forum.forum_icon %}
+                                        {% elseif forum.forum_archived is defined and forum.forum_archived %}
+                                            {% set forum_icon = 'fas fa-archive fa-fw' %}
+                                        {% elseif forum.forum_type is defined and forum.forum_type != constant('MSZ_FORUM_TYPE_DISCUSSION') %}
+                                            {% if forum.forum_type == constant('MSZ_FORUM_TYPE_LINK') %}
+                                                {% set forum_icon = 'fas fa-link fa-fw' %}
+                                            {% elseif forum.forum_type == constant('MSZ_FORUM_TYPE_CATEGORY') %}
+                                                {% set forum_icon = 'fas fa-folder fa-fw' %}
+                                            {% endif %}
+                                        {% else %}
+                                            {% set forum_icon = 'fas fa-comments fa-fw' %}
+                                        {% endif %}
+
+                                        <div class="profile__forum-activity__leader">
+                                            Most active category
+                                        </div>
+
+                                        <div class="forum__category">
+                                            <a href="{{ url('forum-category', {'forum': forum.forum_id}) }}" class="forum__category__link"></a>
+
+                                            <div class="forum__category__container">
+                                                <div class="forum__category__icon">
+                                                    <span class="{{ forum_icon }}"></span>
+                                                </div>
+
+                                                <div class="forum__category__details">
+                                                    <div class="forum__category__title">
+                                                        {{ forum.forum_name }}
+                                                    </div>
+
+                                                    <div class="forum__category__description">
+                                                        {{ profile_active_category_stats.post_count|number_format }} post{{ profile_active_category_stats.post_count == 1 ? '' : 's' }}
+                                                        / {{ ((profile_active_category_stats.post_count / profile_stats.forum_post_count) * 100)|number_format(2) }}% of total posts
+                                                    </div>
+                                                </div>
+                                            </div>
+                                        </div>
+                                    </div>
+                                {% endif %}
+                                {% if profile_active_topic_info is not empty %}
+                                    <div class="profile__forum-activity__topic">
+                                        {% set topic = profile_active_topic_info %}
+                                        {% if topic.topic_deleted is defined and topic.topic_deleted is not null %}
+                                            {% set topic_icon = 'fas fa-trash-alt' %}
+                                        {% elseif topic.topic_type is defined and topic.topic_type != constant('MSZ_TOPIC_TYPE_DISCUSSION') %}
+                                            {% if topic.topic_type == constant('MSZ_TOPIC_TYPE_ANNOUNCEMENT') or topic.topic_type == constant('MSZ_TOPIC_TYPE_GLOBAL_ANNOUNCEMENT') %}
+                                                {% set topic_icon = 'fas fa-bullhorn' %}
+                                            {% elseif topic.topic_type == constant('MSZ_TOPIC_TYPE_STICKY') %}
+                                                {% set topic_icon = 'fas fa-thumbtack' %}
+                                            {% endif %}
+                                        {% elseif topic.topic_locked is defined and topic.topic_locked is not null %}
+                                            {% set topic_icon = 'fas fa-lock' %}
+                                        {% else %}
+                                            {% set topic_icon = 'fas fa-comment' %}
+                                        {% endif %}
+
+                                        <div class="profile__forum-activity__leader">
+                                            Most active topic
+                                        </div>
+
+                                        <div class="forum__topic{% if topic.topic_locked is not null %} forum__topic--locked{% endif %}">
+                                            <a href="{{ url('forum-topic', {'topic': topic.topic_id}) }}" class="forum__topic__link"></a>
+
+                                            <div class="forum__topic__container">
+                                                <div class="forum__topic__icon">
+                                                    <i class="{{ topic_icon }} fa-fw"></i>
+                                                </div>
+
+                                                <div class="forum__topic__details">
+                                                    <div class="forum__topic__title">
+                                                        <span class="forum__topic__title__inner">
+                                                            {{ topic.topic_title }}
+                                                        </span>
+                                                    </div>
+
+                                                    <div class="forum__topic__info">
+                                                        {{ profile_active_topic_stats.post_count|number_format }} post{{ profile_active_topic_stats.post_count == 1 ? '' : 's' }}
+                                                        / {{ ((profile_active_topic_stats.post_count / profile_stats.forum_post_count) * 100)|number_format(2) }}% of total posts
+                                                    </div>
+                                                </div>
+                                            </div>
+                                        </div>
+                                    </div>
+                                {% endif %}
+                                </div>
+                            </div>
+                        {% endif %}
                         {% if show_birthdate %}
                             <div class="container profile__container profile__birthdate">
                                 {{ container_title('Birthdate') }}