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Vitriolic Best Buds: Yumi can be disrespectful and threatening to Kaz (and sometimes for a good reason), but despite that, she still likes him and views him either as a father figure and/or a close friend.
Jerk with a Heart of Gold: Deep down, he cares about the girls and even viewed as a father fugitive to them, despite betraying them at times. He isn't really a bad guy if you think about it, not to the extent of Mr. Krabs at least.
Oblivious to Love: In "Stupid Cupids", a younger woman named Courtney fell in love with Kaz after he got a makeover. He doesn't know the first thing about love when it comes to dating her. At the end of the episode, Courtney dumped him saying he's the worst to date. Apparently, Kaz thought she was annoying.