Brilliant, but Lazy: There a few episodes that show that Kick is actually smart. Like in "Morning Rush" he did a months worth of homework in one night. He also has an innate grasp of the angles and forces involved in all of his stunts, even if he may not fully realize that those are actually math.
Follow in My Footsteps: Both Kick's mother and Kick's grandfather (though we're not sure if it's maternal or paternal grandfather) were both daredevils in their youth as well. And despite the parental grumping about being careful, they're both proud of Kick.
I Call It Vera: His skateboard is named Ol' Blue, and his BMX bike, Bonecrusher. And anyone who lives in Mellowbrook would probably attest that although these are sports equipment, they are weaponized when Kick uses them.
Identical Grandson: Kick looks exactly like his grandpa did when he was younger. Right down to not having a nose.
The Thing That Would Not Leave: Turns out he's not so much fun to have as a house guest as shown in "Live-In Wade". Not for Kick, anyway. Ironically, having him as a house guest made the rest of the Buttowski family think of him as Fun Personified.
Helga, as well - I'm starting to think their relationship is on the verge of collapse after how she yelled at Magnus at the end of Free Gunther about how she doesn't have enough attention paid to her by her husband.
Brad's Room is proof of how Magnus and Harold aren't really close friends, if at all.
Career-Ending Injury: Honey ended her career as a speedboat stunt-woman because she tore her tendanacious ligamental flexor. Kick encourages her to try again years later, but the injury flares up at a plot appropriate moment.
Took a Level in Jerkass: Honey - starting to think this marriage is on the verge of collapse after seeing some scenes of her talking down to Harold, especially in "Brad's Room". And that's not the only time...
Harold's not off the hook either after refusing to help rebuild his son's room in "Brad's Room".