LIGHTNER SPAMTENNA PARENTHOOD?
GIMME GIMME GIMME PLZZZZZZZZZZZZZZZZZZZZZ
<- STARVING ANIMAL NOISES
I'm still working out the details, but I can share the fundamentals of the AU! :D
The Darkners live in Hometown as Lightners.
Spamton serves as an emergency guardian for Noelle as a debt to Rudy while he's hospitalized in the City. They have a niece/uncle type of relationship.
Tenna adopted Susie when she was barely a teen, after his show was taken off the air. She gave him a new purpose after he lost everything. He does his best.
Tenna and Spamton were former business partners that separated due to creative differences. Spamton moved to Hometown to get away from City life and started over as the town's mailman.
Tenna moves back to Hometown (he lived there originally before going to the City) with Susie for her high school years. Tenna and Spamton realize the other is in Hometown, and it's very tense at first.
Susie hits it off with Noelle at school, and Spamton and Tenna figure out that they each have a kid (temporarily, in Spamton's case) and that said kids like each other. Tenna extends an olive branch when it comes to the girls.
The two slowly become friends again and eventually rekindle their relationship through the chaos that is single-parenting and Light World equivalents of the game's plot beats.