I think the best thing abt Trollhunters is Jims' relationships with the adults in his life.
Non of the main adult characters are stupid. Im so tired of shows where the adults (both the good guys and the villains) are idiots [RC9GN, Danny Phantom, Star vs, etc.]
Jims' mom is such a genuinley good mom. She's trying her damn best, her reactions to her sons' shady behaviour is SO REASONABLE.
Jims' relationship with Blinky is so well done, I love how Blinky stepped up to be a father figure to Jim. I love how he's not just the bumbling nerdy advisor
Jims' beef with Strickler is hilarious. Strickler plays his cards well, he's not a fucking idiot, he doesnt let his own emotions and ego fuck up his plans (from what Ive seen while rewatching season 1 anyways)
Tl;dr I love reasonable adult characters in shows geared towards children
Shout out Iron Giant and Avatar the Last Airbender