Coji-Coji has demonstrated his ability to erase the universe, fire powerful beams of energy, and live for millennia.

Much of the humor of the show is derived from Coji-Coji's blunt comments and social misunderstandings that border on callousness.

Coji-Coji makes no effort to conceal his powers, however: his friends simply never notice because he appears too simple and naive.

The title character is voiced by Shizuka Aoki, and it also features the vocal talents of Urara Takano and Katashi Ishizuka.

[3] Coji-Coji (コジコジ) Jiro (次郎) Korosuke (コロ助) Flower Head (頭花君) Geran (ゲラン) Dōdesu (ドーデス) Shougatsu-kun (正月君) Gosaku (吾作) Ruru (ルル) Suzy (スージー) Buhi-buhi (ブヒブヒ) Kettle-kun (やかん君) Kame (カメ吉) Pero-chan (ペロちゃん) Gouta (ごうた) Princess Umebachi (うめばち姫) Hikoboshi (ひこぼし) Johnny (ジョニー) Harehare-kun (ハレハレ君) Tommy (トミー) Teruko (テル子) Margarlet (マーガレット) Zora (ゾラ) Mūa (ムーア) Piroro (ピロロ) Fū (フー) Usa-ko (うさ子) Tanuki-kun (タヌキ君) Houkyau (ハウキャウ) Okame-chan (おかめちゃん) Katsubū (カツブー) Melanie (メラニー) Sensei (先生) Sarasara-kun (サラサラ君) Torada Susumu (虎田進) Hinako (ひな子) Hatena-kun (ハテナ君) Tiny girl (小さな女の子) Orihime (おりひめ) Spider mask (スパイダー仮面)