Hoo boy it's been a busy week so I haven't had much chance to discuss, but goshdarnit I've put all my noms into this character, so I'm gonna make time to make a discussion post about Quote if it's the last thing I do
Quote would definitely be a projectile-based zoner, which as I mentioned back on Reimu's day is an archetype this DLC hasn't really had yet. The weapon experience mechanic from Cave Story would be rather interesting to balance, considering it's a positive feedback loop. With a lot of other character-specific mechanics (Aura, Arsene, Terry's Go, Sephy's wing), you get the boost when you're behind, but I can't think of any existing mechanics where your attacks get buffed for landing hits and nerfed for getting hit. It would make Quote's advantage state really good, while making it harder to get out of disadvantage.
How Quote is represented visually is an interesting question to consider too. Nicalis put him and Curly in their crossover fighting game, Blade Strangers, complete with anime-ish redesigns. Plus, there's their Cave Story 3D designs, which are chibi but still 3D:
Or they could go full-on retro and go with their sprite designs (left is from the original freeware version, right is from Cave Story+):
I'd be happy with more or less any of the design approaches, but tbh I think it would be really charming if they used sprites somehow. A lot of Cave Story's appeal (in addition to being a dang good game) is its legacy, so they could definitely lean on that when designing the visuals, if not with Quote/Curly themselves then with the stage.
Actually, when typing this up I realized an inclusion in another game that's handled visually just like how I'd want to see Quote handled in Smash: Asha from the freeware game
Iji in Slap City. Asha's reveal trailer is here, and you can see some of Iji's in-game graphics at the very beginning of the trailer:
Asha gets his own Slap City 3D redesign, but the stages from Iji (the ones in the trailer with the same orange sky as the Iji in-game segment) heavily lean on the original game's pixel art style. Doing that for Quote's stage, whether it's Mimiga Village, the Outer Wall, or somewhere else, would be a really great homage to the original game's art style.
Those are my thoughts on Quote's visuals, but what do you think would be a good visual design for him (and potentially Curly)?