Buzz is terrible, although he gets his uses with strong enough Zurg friendship.
Alice is a monster, great buffs and debuffs, in giant form makes pancakes out of enemies quite literally.
Woody, great offensive support.
Elsa, very good. Has both damage and crowd control, but goes down easily.
Ralph, good at the beginning, later on needs another tank to even survive.
Olaf. King of annoying tanks. Great stats and utility, lacks damage.
Nick. Good damage and has a charm, but is a glass cannon.
Mickey Mouse. Healing expert, really good but is squishy.
Vanellope. Meh. Although she can turn into a nice backline killer when you get her Merida friendship.
Yax. Once you get a different healer, just throw him in the bin. EDIT: Which you have, Mickey is s-tier pure support lol.
Elastigirl. Queen of single target damage. I don’t know why, but she just doesn’t work well.
Frozone. Meh. Relict of the older generation of heroes.
Hades. A nice allrounder, although doesn’t specialize in anything.