lets plant a garden in the heart of this wasteland

I don't believe Aang was a bad father in the way the show said he was because it's contrary to his entire personality. Someone who helped form the Air Acolytes would never neglect his son because he's not a bender or his daughter because she's not an air bender. Just like I don't believe Luke "There Is Still Good In Vader" Skywalker would try to kill his nephew, it's contrary to his entire personality, Luke would not see his nephew any differently than he saw Anakin, especially when he hadn't yet done anything wrong while Vader had genocided half the galaxy and murdered a bunch of children.

I believe that Simba struggled to raise his daughter because he was overprotective BECAUSE he knows how fucking easy it is for someone to die in the savanna. It happened right in front of him. He also didn't get raised to adulthood with his parents so ofc he's not the best as knowing how to talk to his daughter or explain things to her, he got raised in the wilderness by two gay weirdos. Of course he's insanely hostile to outsiders including the lionesses that decided to follow Scar, Scar killed his dad and nearly caused a collapse of the local ecosystem. And during the course of the movie he has to actually come to terms with how he's letting his trauma control him and it's drive his daughter away. He gets to apologize and admit he was wrong, he gets to grow.

And yeah you could argue we don't really get to see Aang or Luke interacting with their families because that's not when the story is set but there are still ways to make sure your characterization is consistent, and I'd argue in cases like Aang and Luke where you don't get to see them when they were raising/interacting with their young families it's even more important for you to keep the characterization consistent because we don't get to see the character grow and change we just see where they started and where they ended up, so if you change too much it's gonna feel weird.

Compiled some basic information I know about drawing fat characters for beginners since I've been seeing more talk about absence of really basic traits in a lot of art lately.

EDIT: Wisely pointed out in the time since posting -

Fat doesn't pile on joints, but it does sit there. Hands get fat too! Don't just draw a skinny person's wrists. Add a little mass to fingers.

Fat people can also be bony! Think of areas your eyes are drawn to on an extremely skinny person, like the ribs, elbows, shoulders; this is where the fat isn't as prone to building, and a fat person can be mostly rounded with bits that stick out or "pucker".