Ok, so they didn't really rip-off Beetle Bailey. It's just that like BB, we don't really see Kyle's eyes. His hair is in the way.
Kyle only talks once in the entire series but he appears a few times (as background) He likes Yakko but Yakko would only give him a chance if he became "The World's Greatest Magician" that was currently being held by Chacha. So Chacha (who wanted to get rid of the title) and Kyle devised a plan whereby Chacha would lose on purpose to Kyle. When Seravi beat Chacha and regained his title with the snap of his fingers, their plans were kinda messed up.
Yakko probably likes Kyle. She just won't say.
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