Also known as: マイティフォーム
The basic form of Kamen Rider Kuuga.
The armors on the torso and shoulders, eyes are red. The gems on Arcle (Kuuga) buckle, forehead, bracelets and anklets are also red.
It does not use weapons, but performs hand-to-hand combat.
This form's special move, the Mighty Kick, is a right-footed Flying Kick with flame-like Seal Energy.