Also known as: 天野景太, ケータ, 天野ケータ, ケーウィス, 理科ケー
Protagonist of Youkai Watch. Voiced by Tomatsu Haruka.
He has short Brown Hair and Black Eyes. His usual outfit is a red T-Shirt with a Star (Symbol) on it, grey Cargo Pants with a Belt, red-, white- and blue-striped Boots, and his youkai watch. In winter he wears a red Hooded Jacket over a Yellow Shirt.