Yeah I don’t think it’s a Pokémon:
Sakurai has been hyping the hell out of this, more than anything else.
His phrasing here implies the character is someone big to gaming that even casual people could enjoy due to their legacy.
Japanese tweet also mentions how we may or may not know this character but not any other versions.
That part could mean nothing, but perhaps this is a big Western Rep who has a strong legacy behind them.
Or just a strong character in general for legacy.
Which I’m just saying, Sora, Master Chief, Doom etc, kinda of all fit that bill.