I consider myself absurdly lucky to have gotten several characters I genuinely care about each time around in smash. Since i've been active in the smash community, Brawl gave me Ike, Sonic, and Wolf. Smash 4 gave me Shulk, Bayonetta, Megaman, and Little Mac, and Mewtwo. And ultimate has given me Wolf again and K rool. Often times when I find myself wanting more fighters, I honestly almost feel ungrateful. Like the spoiled child who keeps asking for more and more, and who's family keeps supplying and never saying no firmly. If and when Isaac were introduced. I'd be at the point where I think i'd no longer care who was introduced, just being finally completely satisfied. At that point i'd just take a step back and say "Mission accomplished"