Okkotsu Yuuta's Fighting Style
Kenjitsu and Iaido: Katana and katana-drawing arts, learned from Maki Zenin. Performed here by Naganuma Noriaki Sensei and his students, as well as Seki Sensei.
ε
«ζζ³ (Bajiquan): Chinese close-range art style. Yuuta uses this when he's fighting in the shoulder, elbow, and grappling range. Likely learned from Maki and Gojo. Performed here by ζειΈ£ (Li Jianming) and ζζ¬εΎ· (Li Jingde). Yuuta performs a cross-elbow and a tie shan kao.
Wrestling: Yuuta uses this to close the distance and do damage after realizing that it isn't worth it to take more damage in the punch trade against Ryu. Here, he performs a rear-naked choke and a suplex. Demonstrated here by Craig Jones and Jeremy Waldner.
εζ― (Nangun): Chinese staff, mostly Southern. Yuuta's grip being at the end of the staff rather than the middle, as well as the overhead strike and bent-knee stances he utilizes, are characteristic of this style. The sweepyness of his strikes gets a little closer to contemporary staff styles as opposed to Southern, but he's probably learned both. Learned from Maki Zenin. Performed here by ζειΈ£ (Li Jianming).
Japanese kickboxing with influence from Capoeira, because I have no idea where else you'd learn this freaky ass cartwheel kick. He squares up using mid to close-range boxing and spinning wheel kicks. Performed by Professor Aventura and Yoshinari Nadaka.
Tuck them elbows in, lil' bro.
Analysis: Yuuta's melee fighting style mirrors his character as someone with layers of facades. His body does not scream "power fighter," but his CE allows him to adopt an in-the-pocket striking style mixed up with longer spinning kicks. He uses his CT similarly deceptively. If all sorcerers are frauds and conmen, Yuuta stands as the greatest liar of them all.
Similarly, his surface-level impression as a "power of love and friendship" character is a deception that hides his willingness to get down and dirty. Indeed, even his aptitude towards friendship and empathy is, as Geto pointed out in JJK0, an ultimately selfish attempt at self-affirmation. Yuuta values his friends because that is how he can affirm his sense of self, and even if his love can be "giving," it has a motivation and nature for "consuming." Yuuta is kind and attempts to be understanding, but this perspective alone is a deception for his selfish lack of self-interest, just as his technique and fighting style lie and lie again.
TL;DR: Yuuta is a liar, and that makes him an interesting take on the power-of-love trope.