One of the best representations ive ever seen is in The Penguin. He has a stutter however it doesn’t define his character, its just a feature he has, like how it SHOULD be represented. It also shows the best advice for people around those who stutter, which is to just let the person speak and don’t make a deal about it/bring it up. The worst thing you can do is say “slow down, take a breath” and make you aware of it.