And the funny part is, when Iris dares have 'quirks' of her own, you get a 50 post thread whining about how much of a Mary Sue she is and how much she sucks compared to Dawn.
I don't really think that's why people call her a Mary Sue, but heck I don't even know why people have called her one. This thread isn't about Iris anyway.
As for Iris her quirks are:
-Snarky behavior (what a pain/kid)
-Dislikes the academics
-Scared of Ice-types
-Likes some Football teams/sports
-Eats around romance
But her quirks don't have as much focus as Dento's.
Yet, in-universe, everyone likes him and needs to learn from his 'wise' advice, and those who step out of line (Burgundy, Skyla, etc.) gets portrayed as a complete idiot who just needed him to ride to the rescue and show them the light.
Blah I could argue more but this is just getting into bias stuff.
Flaws don't need to be spoon fed to people to be flaws. People don't need to overcome their flaws to have a flaw.
-Overzealous
-Confident/borderline cocky to where he tells his opponents his plans
-Afraid of Purrloin
Those are indeed character flaws, they spice him up.
Let's look at Iris's flaws:
-She thought winning was the most important thing (when she was little)
-Her snarky behavior
-Afraid of ice-types
-Can't read/bad at school
-She can be overconfident at times, and even a bit vengeful
The only difference is that Iris had to come to terms with Excadrill, she was just a little girl then, she didn't know she hurt him. And she has gotten better with Ice-types.