Water bucket, bucket for short, is, ironically, he has a phobia of water, and has many other irrational fears- and just fears most stuff in general. He therefor uses red paint for his "insides", because to him red is the opposite of blue (not only is he a scaredycat, he also is kind of stupid) he's very emotional and often leans on friends for support. He likes trying to make friends.
I want to call him Jerry but that doesn't suit him. Mason, maybe.