Not exactly super hype for the rumor. I kinda question if it is even true due to the part about Steve being held back. It seem very possible this part is fake and is just piggybacking off of Verge's old claims.
Joker: Very cool, was always interested in playing P5 but it was a Sony exclusive. Not what I expected but I will take it.
Erdrick: Not interested in DQ at all. Don't mind but also don't care.
Ryu: Not too interested as well, but if he makes it in I would consider checking him out more.
Doom Guy: Pretty hype and is one of my wanted character, though I kinda question if he has a chance as he is a western character.
Steve: Sigh. I really don't want Steve. I am cool with Minecraft and would be okay with a boss or a stage, but I don't really find any appeal in Steve himself. Plus, imagine if there was a Banjo and Kazooie skin cameo was in the stage xP (they would just randomly appear in the background and wave hi). The salt would be pretty insane for this character and I kinda fear that.
I've been warming up to Steve - he's unquestionably deserving and a Minecraft stage could be really fun. It's not something I'd go out of my way for, but I'm not opposed to it.
My biggest issue with Doomguy is just that he's the big competition for my absolute most wanted, and mine really never had a chance against the more popular one. It was the same with Tails vs. Shadow and why I wasn't a fan of the edgehog. In either case, I'd have absolutely no issues if both got in, but if we're only getting one, I'm frustrated that my favorite is the one being left on the sidelines in lieu of one who I have no connection to. He's cool and normally I'd be hype, I'll give you that. He's just not the Dragonborn.
The other three - no clue. I don't like JRPGs on principle, and I've never had a playstation, so two of those are complete unknowns to me. The third I know even less about.
With all of them, I've decided I want to see them in action before I decide to put money down, but I'm not crazy about them just from the names. I've been thinking this for a while with most games though that I shouldn't put all of my hopes on DLC and get the passes - I usually get the DLC packs for games sight unseen, then I never end up playing the characters, so it ends up feeling like a waste of money and just disappoints me more. Big one for me was Mortal Kombat since I hate horror films, so most of the DLC guests they put in were literal whos for me and didn't excite me at all.
I suppose if one of these guys looks cool I'll spring for it later. I'm sure all five could have great kits and be loads of fun, but as someone who has no connection with any of them, I'll wait and see. Who knows, one of them could interest me later - I was bummed by the end of Sm4sh DLC with Corrin and Bayo, but the witch was actually one of the characters I was most interested in seeing for this game.