I know he gets a lot of hate, but I really like Jakob (Joker was a cooler name, though). I mean, it's implied he tutored his son in martial combat prior to their support and all, and Sea did challenge Jakob directly for his job (which is what keeps him close to Kamui, pretty much all he cares about), and Jakob didn't come from a coddled environment where he would even know how to act like a permissible parent (not that I can justify his behavior, lol). I think his assery is genuinely funny (as I judge characters more as funny tropes than actual people). I think his dedication to Kamui is sweet, even if he's not my favorite ship for Kamui. I also really like his design.
I expected Zero as a character to disappoint me when I first read his profile (something about a sadistic thief, and I immediately assumed he'd just be creepy and torture people and all that, which may be true - but he's surprisingly flirty and surprisingly endearing). He has consistently good supports, as well. (And RPing him on Gamefaqs for so long has also made me like him more. :p)