So far out of the 5 starter characters, Elastigirl holds up pretty well even in mid and high levels.
She doesn’t overshadow the newer damage heroes but she can still be useful in situations.
Yax - KO’s too easily, mediocre heal. Everything hits the back position, Yax gets 1 shotted.
Frozone - Lackluster purple skill, worse cc potential. Dr. Facilier literally nukes and stuns a target.
Vanellope - Laughable AOE damage, really bad damage scaling. Use Ducky and Bunny instead.
Ralph - Suffers from bad overall stats, really bad ability scaling. Great kit, awful stats.
Elastigirl - Simple but effective, can do burst damage, a really powerful friendship disk and a good alternative disk. She scales pretty okay with her abilities and is still useful in some comps.
I mean it really hurts players who really like these characters but has to deal with the fact they’re always be destroyed by power creeping heroes.
(Power Creep - A newer character/card that’s clearly overall better than the other ones.)