Aizawa was tired. Yakushi was a brat who led other people into brattiness in a way that would keep them alive when they were out on the field. Those things were inexorably connected.
Design was still populated by perverted idiots who thought that giving people things that belonged in fetish flicks was reasonable. This year's costumes were disturbing. Sexualized rubbish for the girls, Kirishima's costume rivalling Midnight's when it came to the BDSM look, Bakugo's disturbingly villainous appearance, only accentuated by the domino/eyeliner.
At least those made sense in the context of their quirks. Todoroki's actively inhibited the his quirk in a glaring neon sign saying "Quirk Issues", and why was it that the only people to catch it before today were involved in Oto? After that, there were the standard personalities. Aoyoma, gah, sparkles. Tokoyami--brooding darkness, and Midoriya, homemade donkey ears. He could tell that the boy was trying to evoke All Might's signature hairstyle and grin with the gear, but the costume provided even less protection than the standard UA uniform. On the other side of the spectrum was Yakushi, who's "costume" was modified special ops body armor with the contents of the tactical webbing replaced by medical supplies, and a white doctor's coat thrown over the ensemble as a concession to the fact that what he was wearing was a costume. The coat didn't make the boy stop looking disturbingly like a killer, it only turned the look from something from an action movie into something from a medical horror show. The grin and drawn scalpels didn't help.
Design had included a distressed note about how the costume request were terrifyingly technical, utterly utilitarian, and how someone had included an end note about how if they tried to alter it, Design would be testing its functionality under live fire.
Bakugo was put on opposite sides with Midoriya. Nothing good came of the matchup, and Yakushi automatically healed Midoriya afterwards.
Others turned out normally, until Yakushi, who was partnered with Hagakure. The utter and absolute brat was on the villain's team and playing it up even more than Iida. Then he backstabbed his partner, "surrendered" to the heroes after making up a tragic backstory involving invisible cake, then backstabbed the heroes again when Hagakure turned out to not have been incapacitated at all since Yakushi had used medical tape to fake her being captured by the capture tape with a slight of hand. The villain duo had the time of their lives acting out their characters as they tied up the unfortunate Kaminari and Ojiro.
What had Yakushi's life been like?
Villain Team won, after using dishonorable tactics that had All Might sweating.