I'll lead to the bias side, but I don't see this Katalina having any shot of being real. Among requirements to be in Smash, the character needs to be iconic, have a significant history with Nintendo and/or in the eyes of Sakurai need the public spotlight to bring back around to relevancy. If this character is apparently fairly new, thus lacking the history, not particularly needing to be exposed because it's big in Japan but middling elsewhere, and having nothing iconic being molded out of the same basic anime cookie cutter format that you see everywhere, then she's not much of an all-star that needs to be elevated to playable character status.
That could just be the part of me that's so freaking done with similar-looking anime swordsmen in Smash though, at least less important ones in video game history. It still personally feels odd in a mash-up game of this size and concept that Final Fantasy doesn't just have less reps than Fire Emblem, but the later is attempting to hold the biggest margin of characters in the roster while the former is stuck with just one. Yes, yes, I know, character rights for who owns what and FE being much easier to just throw characters in, yadda yadda, but still, it irks me for some reason.
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Minecraft I have no connection to; tried it out when it was a beta, wasn't much fun but it sure as hell blew up with the next generation of kids once it went public and is something big enough I could warrant a spot for. Just it's the nature of how the characters are all blocky from that game which I imagine doesn't translate well to a 2D fighting field where you're always facing them from a certain angle but their movements still need to be dynamic. The guy would just be stuck with very wooden animations and a lot of body clipping with the arms waving around.