Personally, I LOVE that the game isn't focusing solely on main characters first and I wish that Smash did more of that. Grandma Gertie is an awesome pick (kudos to Nick for that decision), and I even like that Gerald is gonna be playable. He's actually the leader of the gang in-universe, but because of the nature of Hey Arnold fleshing out each of its characters, pretty much any one could work (Jolly Olly Man/Big Patty/Eugene/Lila/Herald are my most wanted from the show, ahaha)
Anyway, it's nice that the devs have more of a budget. The updated movesets and other new features/polish turn an already solid platform fighter into something special. The first game is super fun but the sequel has potential to be one of the best in the genre, in my opinion. I can't wait to play