I had a few trait ideas that could affect what actions your character finds “fun” or “depressing”.
In a thread about pets, someone mentioned that if you had a pet like a dog die near you, you would suffer a morale penalty. If you had a trait maybe called “Heartless”, you wouldn’t give a damn over various things losing life in an already dead world. Like zombie children and “innocent” pink people. Maybe a criminal who escaped captivity due to the chaos might have this trait.
Another idea: If you mutated using fish mutagen, there could be a deep mutation that gave you morale when you get wet?
This can go well with a weapon mentioned in that one weapons thread. A super-soaker! You can probably shoot yourself to get wet. Of course, you can also argue that pouring a bottle of water on yourself should be possible too. The main point of the weapon from that thread was to use it as an ingredient for an acid sprayer though.
And even then, I’m not 100% on how being hot + wet works. Wet makes you sad, hot = bad. Can’t someone make those little handheld fans that shoot water for the summer? You could get a “Refreshed face” morale bonus. Or “Refreshed gills” for the fish one.
Here’s a random trait idea that was inspired by youtoo: Tubby
Sitting on your couch all day watching the telly seldom prepared you for the apocalypse. At least you enjoy all kinds of junk food. (Better morale bonuses from eating chips, pretzels, jerky, candy, etc). I kinda wrote it like a profession though…