Bo-bobo summoning Yugi Mutou from his afro during the fight against Halekulani.
Jelly Jiggler, who is the residential Butt-Monkey, reminds everyone why he was A-Block Leader when he curbstomps his lieutenant in the Emperor Playoffs Arc. Beauty and Gasser immediately apologizes to him for Underestimating Badassery.
Professional/Super Patch, both versions have acting much seriously than normal, and an utter badass played straight (for the most part) as he dominates his opponents.
Despite having zero combat experience, Beauty refuses to betray her friends, even if that means taking on Blonde Chainey herself.
The Don Patch vs Poet fight. Poet has just delivered a Curb-Stomp Battle to Jelly Jiggler and Torpedo Girl and is about to kill Beauty. Don Patch jumps in front of and is able to No-Sell the attack because of how stupid he is and then weaponizes his stupidity to make the rest of Poet's attacks totally ineffective.
A small one, but Bo-bobo's battle against the Hair Hunt Troop in Episode 13 is surprisingly cool, because there's no real gimmicks at use, just Good Old Fisticuffs (until Bobo-bo unleashes his nose hair), with Wild Challenger playing in the background.