Luffy, Naruto Uzumaki, and Zatch Bell from the One Piece, Naruto, and Zatch Bell series respectively. Goku has been cited as an inspiration for such protagonists like Monkey D.There is also a 4-episode story arc where the young Goku ends up in Penguin Village with appearances from Ninja Murasaki, General Blue and even Shenron. Another time Arale puts the last volume of Dragon Ball into the Reality Machine and a black and white Goku comes out and fights a black and white Kid Buu. In one episode, Arale Norimaki and Akane Kimidori are seen playing a Dragon Ball Z video game with Akane playing as Goku and Arale playing as Vegeta. Slump remake from 1997 has several references to Dragon Ball.
Arale and Akane playing a Dragon Ball Z game in the Dr.
