Deck Afta

A boy who is a friend of Cosmo's and Kasha's on Solo. He's generally seen with Rapappa, a tame two-tailed squirrel perched on his shoulder. Although just a young kid, Deck desires to become a pilot of the Ideon and when Cosmo sees how dedicated he is to it, he allows Deck to become his co-pilot on the Ideo-Delta. As expected for his age, Deck is immature at times but for the most part gets along with everyone though gradually as the series progresses he begins to prove himself as a pilot, establishing himself as a predominant role in controlling the Ideon.

(Source: Wiki)