Some of my characters have some form of Kleptomania, the impulse to steal objects.

Inke - Anything she gets her hands on, people, clothing items, toys, collectables, anything she gets, it's hers.

Cyber - Its mainly for gems like Chaos Emeralds or Chaos Crystals, often doing insane stunts in order to obtain the gem. Some say Eggman somehow hardwired that into his brain so that he will find the Chaos Emeralds and collect it, letting nothing separate it from him. But this occasionally leads to petty thefts like fake gens or diamonds and shiny jewelry.

Hellion - Anything related to her ships, is hers, no fighting it. That plant as the same name as a person in one of her OTPS? Hers. Romantic drawings that resemble her favorite characters? Hers. A hoodie reminds her of the time the boy gave the girl his sweater to keep warm? HERS.

Dai - Being a reaper, she take a few more lives than she should half of the time.

Kami - Free treats with no spoken or written limits, she will snatch them all up and run.

Julian: Basically any weapons, or whatever he used in a fight. It doesn't matter the worth, he takes it if he likes it..

Immortal - Rarely ever goes overboard, she just steals one thing of worth before leaving. A diamond, jewelry, book, weapon, art, she takes one from each universe. Although she has no shame in stealing almost all of the cheap pens from schools or banks.

Titus - Just very cheap stuff, like an extra piece of paper or an extra one. He mainly does it if he'll put it to use sometime, it's not too often. You will find this habit somewhat helpful since he takes bandages or minor medical supplies.

Bonus: Cyber will do ANYTHING for the gems, legal or illegal, so he occasionally steals from GUN or the Villains with no regard for danger.

Everyone knows what to do in a zombie apocalypse, just shove Titus into a hospital and wait for him to come back.