[Snake]

Might sound funny, but I'd love this for personal reasons.

Trait - Compulsively Healthy

You have a problem with how meticulous your physique is, and you can't stand being rough around some edges. Your total maximum HP will be rounded up to a multiple of 5 (or 10, if higher than 5).

Ideally, this will merely round up your HP after all out-of-combat bonuses. (Except battle bonuses);

So something like 701/702/703/704 HP gains +4/3/2/1 bonus HP, becoming 705 HP.

or 706/707/708/709 HP gains +4/3/2/1 bonus HP, and becomes 710 HP.

Muh OCD.