Akihisa,In Baka Stars, has 2 imaginary friends Gilbert(The fish),and Oz (The rabbit).He has them because when he was was young he always felt by himself.Whats more is that he was expected to not talk because his rich family had a reputation. So he was expected to be the quiet polite"perfect"little son of the"perfect"family.He was told he would get everything if he just stayed quiet.He got all the material things but never anyone to be close to.So all his thoughts manifested in imaginary friends.