Kotaro Sakuma (Debo Sentai Kyoryuger)

Kotaro Sakuma (佐久間 小太郎) is a young boy who defied Jark Matter's occupation of Earth. He later gains his the ability to become KogumaSkyblue (コグマスカイブルー) and OogumaSkyblue (オオグマスカイブルー). This article describes the Kotaro native to the reality where Debo Sentai Kyoryuger takes place in.

Past
Presumably, this version of Kotaro's background matches up with the main version of Stinger from the World of Kyuuranger.

At some point, he eventually decided to quit being a Kyuuranger. Kotaro, alongside Champ, was seen tending to Stinger.