Cave Nilga

Cave Nilga (ケーブ・ニルガ") is a character exclusive to the Nintendo DS video game, Tengen Toppa Gurren Lagann. Introduced as the First Prince of The Spiral King and older brother of Nia Teppelin, it is later revealed that he was a Beastman with fake memories implanted by The Spiral King as a mere experiment and disposable puppet, much like Nia herself before him.

Appearance
Initially, Cave appears as a fair-skinned human with sharp, angular facial features, such as his eyes, nose, chin and pointed ears. His overall appearance, specifically his hair and clothing, greatly resemble that of Nia's, with his short hair displaying hues of green and yellow with a light blue tint, and his clothes displaying various golden ornaments, jewelry and a cape. He also wears a very small pair of round glasses. He exudes an air of nobility and superiority.

After his Beastman nature is revealed, he assumes a much wilder form. He loses his glasses, his eyes open wider with the scleras turning blue, and his hair assumes a flame-like aspect, gaining hues of purple and pink and resembling Lordgenome's flame-like aura present during his battle state.

Personality
Being the only human close to The Spiral King, being above even the Four Supreme Generals, Cave is a vain, egotistical and truculent individual. He mocks Nia for being cast aside by their father and treats his comrades and underlings harshly, with no respect or consideration for their well being. When he finds out he is actually a Beastman, he becomes crazed with incredulity and rage, and turns even more violent, fixated on defeating Gurren Lagann and Team Dai-Gurren.