Guy who played GBFV's beta test here. Katalina is one of two pretty basic shoto characters in the game along with Gran, the main character. She has a projectile which is a single sword of ice she fires forwards, a rushing attack where she stabs forwards while moving, a shoryuken type move where she slashes her sword while jumping, and a barrier that absorbs every incoming hit for a short time and has her counterattack when you let go of the button. She's very basic in the grand scheme of playstyles for fighting games, and her moveset isn't exactly all that inspired. Granted I feel like there isn't a great ton of wiggle room for her to have given her role of a low-damage support unit in the mobile game, so this is likely the best they could do.
One interesting thing she has about her is that in her Super Skybound Art, the strongest supers each character has, she summons a sort of knight stand/persona that, to my knowledge, hasn't made an appearance in any Granblue media outside of Versus.
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It's only used for her SSA, but I feel like this will come into play in the original game soon, especially whenever she gets her 5* uncap. Which means that, if she does come to Smash, it will likely factor into her moveset in some fashion. I think giving her a Persona but maybe having her operate in a semi-unique way from Joker, such as having it be a constant part of her moveset rather than Joker's temporary power up, could work.
On a different note, I guess you could put me on the support list. Katalina isn't my first choice for a Granblue rep but she seems to be the only one who had any discussion, even if it was only because of Vergeben. Sad to see people writing Granblue off just because it's a mobile game/gacha or because of Katalina's design. Game is really good and I wish the Smash community would stop being so closed minded like it usually is.
Hating mobile games doesn't make you more of an epic gamer despite what reddit says, guys.