Okay first of all. Reading the OP. NEGAN IS IN TEKKEN?! I didn't watch EVO and hadn't heard anything about it until reading it here and as a big fan of The Walking Dead this caught me as a huge surprise. If I had a system that played Tekken 7 (PC not counted, I'm a console gamer) I might've gotten it just for Negan honestly. And I don't really care much for Tekken otherwise, but that's more because, aside from Smash Bros, I don't really care much for fighting games to begin with.
That said, onto the topic at hand (apologies for going off-topic for a bit, I just really wanted to speak my mind on the above matter for a moment), Goku getting into Smash Bros feels like it would be a similarly big surprise as Negan getting into Tekken (to me). That said, I also think Goku would fit into Smash Bros a little more than Negan does in Tekken, and really, memes aside (I'm really not a person for memes) I don't think I would really mind having Goku, if he were to actually make it in.. somehow. That's mostly because I watched a fair bunch of DBZ as a kid though, and he DOES have a good amount of appearances on Nintendo consoles. I'd welcome him with open arms really, even if I'm not a full-on supporter for him.
When I see people actually rooting for Goku though, whether it's genuine or not, I just can't help but wonder how genuine they really are over the matter because of the meme status this has gotten to over time and frankly I find it rather annoying.