Diem
Agent of Phaaze
Kirby, Metroid, and DK only need four characters each in order to have everyone they'd need.I don't remember people complaining about too much Zelda. Kirby, sure, but that was mostly in Brawl days.
Somehow, Metroid got there first. (yayyy) It doesn't need any more characters until Sylux returns.
Kirby just needs either Bandana Waddle Dee or Marx to round out its representation.
And DK just needs Dixie Kong to round out its roster.
I don't think that's too many for any of them. The fact that people think Kirby, one of Nintendo's biggest franchises, having three characters is too much is just baffling.