diff --git a/util.php b/util.php
index 6ee4e98..03473e1 100644
--- a/util.php
+++ b/util.php
@@ -139,7 +139,25 @@ function assert_unless_success(Result $assertion, Throwable|string|null $descrip
 
 if (AUTH_ENABLED) {
   function getcookie(string $name): string|null {
-    if (!$_COOKIE[$name]) return null;
-    return $_COOKIE[$name];
+    return $_COOKIE[$name] ?? null;
+  }
+
+  function namecolor(\stdClass $userData): string {
+    $ban = "#888888";
+    $male = "#97ACEF";
+    $female = "#F185C9";
+    $ungender = "#7C60B0";
+
+    $gender = 'color: '.($userData->gender === 0 ? $male : ($userData->gender === 1 ? $female : $ungender)).';';
+    $style = $userData->namecolor ?: ($userData->role >= 0 ? $gender : $ban);
+
+    $showname = $userData->displayname ?? $userData->username;
+
+    $color = "<span style=\"{$style}\">{$showname}</span>";
+    if ($userData->role === 1) $color .= "<span style=\"font-size: x-small; background: #10c074; border: 1px solid #fcfcfc; border-radius: 10px; padding: 0 0.5em;\">✓</span>";
+
+    $suffix = $userData->gender === 0 ? 'くん' : ($userData->gender === 1 ? 'ちゃん' : 'さん');
+
+    return $color.$suffix;
   }
 }
\ No newline at end of file
diff --git a/view/common/header.maron b/view/common/header.maron
index bcee022..d4049fb 100644
--- a/view/common/header.maron
+++ b/view/common/header.maron
@@ -59,7 +59,7 @@
 {@ if (AUTH_ENABLED) @}
       <div>
 {@ if (isset($user) && isset($user->id) && $user->id > 0) @}
-        お帰りなしゃ～い、{{ $user->displayname ?? $user->username }}さん！ (<a href="/logout">ログアウト</a>)
+        お帰りなしゃ～い、{{{ namecolor($user) }}}！ (<a href="/logout">ログアウト</a>)
 {@ else @}
         <a href="/login">ログイン</a>
 {@ if (AUTH_REGISTER_ENABLED) @}