Uh, yeah he would be. A guy who actually has stands out from Marth more and has magic to be more unique and was actually significant, appearing in two games. This sarcasm of yours just comes off as rather silly and ignorant to me. Kind of in the same way I would react if someone sarcastically said that
"Oh, sure! Palutena is MUCH more important than Dark Pit." It's so ironic because what you expect is to silence me as if it were a rhetorical question. When funnily, the answer to your question is a simple and direct:
Yes. But, what's even more ironic is that I expect that it doesn't need an explanation, but to the majority of Smash fans it's all about recency and internationalism automatically triumphing over significance and recurrence. So the mere thought of a Japan Only character in Smash or someone who doesn't live up to your bias and personal views on what YOU and people on YOUR side think
should happen, results in you scratching your head and acting like me even bringing up a more significant character is "Highly unorthodox" because he's not
muh recent. But, I don't expect to change your mind. So I'll just leave it at this:
Yes. Of course he is.