Kashira emerges as the de facto leader of children transported to another world, even though Shachou holds the elected leadership title. His background includes a marine club excursion prior to their displacement.

Personality-wise, he displays a penchant for joking around and flirting easily with girls, sometimes unintentionally provoking anger. He demonstrates significant courage, physical aptitude, and a readiness to take risks protecting friends. This frequently sparks conflict with God due to their opposing viewpoints and leadership clashes.

Key abilities center on inherited firearms proficiency from his father, essential for defense against threats. While he wields swords in combat, he lacks expertise and favors guns as his primary weapon. A strong sense of justice drives him, particularly concerning mistreated dinosaurs and oppressed groups. This moral stance gradually earns respect from former adversaries like General Mosar.

Character development sees his initial recklessness mature into responsible leadership. He unites human and dinosaur factions against oppression and plays a pivotal role coordinating efforts to destroy an incoming meteor threatening the world. His survival instincts and ability to motivate prove crucial for the group's cohesion.

Romantic elements involve fleeting attractions to multiple female characters and a significant, unresolved first kiss shared with Hime.

His ethnic background is half-French and half-Japanese, differing from the source material's protagonist.