Banjo and Agumon would more then make it enough for me to be satisfied.
Tbh I'd be disappointed with Agumon.
Like, Namco-Bandai has so many great IPs, and Sakurai chooses Digimon, a series that, while at is peak capable of competing with Pokémon, has since faded into niche status. Compared to Tales of, Dark Souls, Soul Calibur, or Tekken, Digimon is just boring.
I'd be kind of disappointed with Chrono too, since, similar to Namco-Bandai, Square Enix has great IPs and they went with Chrono. Like, why not go for Erdrick or a DQ Hero instead? Especially since Toriyama is on board. It doesn't make sense.
Banjo is kind of disappointing since I personally want Steve, but the Banjo Bros. are such a wholesome fanbase that I'd be happy for them.
I'm totally okay with Reimu though. If a 4chan meme actually got into the game I'd have a good laugh.