Super happy and excited that it sounds like your enjoying the small bits of lmk so far!! When I first got into this show I got immediately hooked- I'd be even more curious to hear your little journey watching this, like more thoughts/any hc's or like you mentioned, possible fanfic ideas? :3c
I'mma be real most of the stuff I do know is from s3. Specifically Mei's Samadhi Fire and her training with Red Son. Also she yells at Wukong at one point? I have exactly ZERO context for it but it has given me fic ideas!
Specifically of Mei still dealing with the aftereffects of her big blowout with Sun Wukong (which might be dealt with in canon, idk!) and Wukong being distant with her bc, well, she was right. Mei heads out one night to blow off some steam and Red Son shows up bc he saw the fire and was like "oooh what are we destroying tonight". He convinces Mei to leave her less than healthy coping mechanisms behind and they go to a kid-appropriate club (now that I'm watching this weather club episode, probably there!) and they dance (basically The Dancing Dragons from Avatar) and Red Son casually explains that he can feel when her fire activates from his own leftover vibes with it. I'm specifically thinking of a bit like:
"Oh," Mei says, twirling. The Samadhi Fire had always burnt hot inside her. It was like a constant source of heartburn, eating away at her chest and throat. "Does it... hurt?"
Red Son scoffed. "Hurt? Please. You forget I'm built of fire, Dragon Girl." He sobered a moment, voice almost soft. "I imagine it's very different for you. The fire was made to burn you apart and cause the world to fall to its knees. But to me..."
They clap their hands together side by side like swords clashing, bits of fire escaping their fingers. Red Son was... smiling?
"To me, it feels like home," he finished.
Wukong eventually tries to break up the party because he's on over-alert mode and he's not sure what to make of Red Son. Sure, the kid is usually just a fun distraction, but coupled with Mei's mental state he's worried about the boy forcing her to do something. Mei almost kicks his ass but Red Son stops her (mostly because he likes the club and doesn't want it obliterated). Mei stomps off and Sun Wukong watches pillars of fire burst upwards in the distance.
Red Son is like "you want my advice?" and before Wukong can be like gross, no, never, he goes on. "Stop treating her like a villain, or she'll end up as one. The reason she comes to me is because I treat her the same as I always have- an obnoxious brat I'm stuck with."
And then Mei and Wukong hash it out lol.
(Fun fact the whole thing would be set against "Burn the Whole House Down" by AJR bc Red Son gives me those vibes)