FISHY
"Good news, everyone!" Melissa said. "Though the pumps for the emergency exit aren't working and bathysphere access is cut off by the security room up top, we have a very convenient way to get to the next level."
"Please don't be the air shaft," Kaminari pleaded.
"This floor happens to have a device that can turn us all into fish!"
"Please let us take the air shaft."
"Do you really want to deal with the super-radioactive cancer cockroaches that ate the radioactive metal spiders?"
Kaminari raised a finger. Then lowered it. "Objection withdrawn."
"Excellent! If you'll all get into the device, I'll go ahead and fire it up."
Everyone crammed into the fishification chamber, a tight squeeze even by clown standards. With a zap of electricity and a quick flush of salt water, it got significantly less cramped.
"Great Scott!" Melissa said. "I've turned into a horseshoe crab! I didn't even know it could do that."
Kaminari swam in circles, tring to touch his own tail. "I'm really eeling it!"
"Really?" Ochako asked, doing her level best to give him an unimpressed look as a rainbow jellyfish.
"What? I'm an electric eel!"
"Uh, guys?" Sato asked, puffed out and pointing spines everywhere. "How do I stop?"
Kirishima clacked his claws. "Let me try."
"No no no, wait-"
Kirishima squeezed. Sato's eyes bulged out as his body nearly squeezed in half, before he shot out one end and bounced around like a rubber ball. As Sato sailed towards Ojiro, the mantis shrimp made a lightning-fast punch that deflated him.
"Whoa," Ojiro said, marveling at how the water boiled before his claws. "Now this is the kind of punch I'd go bald for."
"I don't feel any different," Tsuyu ribbited. "Are you sure it worked?"
Iida, now a sailfish, swam circles around Tsuyu. "I can't tell. Maybe my new form has trouble picking out minute differences?"
Aoyama dangled a glowing bulb in front of Tsuyu. Mon dieu, you look incredibly appetizing, Tsuyu!"
Tsuyu gave an alarmed croak and hid behind Jirou, who gave her a reassuring clicking noise and blew bubbles out her blowhole.
"What kind of fish did I turn into?" Mineta asked. "I can't see!"
Everyone recoiled in horror at Mineta's lumpy appearance.
Shoji mumbled something against the glass. When everyone asked him to speak up, he detached one of his five limbs and asked, "How are we getting out of this tank?"
"Oh, that's easy, I just have to press… the button… oops."
"You mean, we're stuck like this forever?" Sero asked, trying to un-stick himself from his own tail.
A giant cockroach scuttled over to the control panel. It observed them with giant, pulsating eyes, then hit a button on the panel.
As they got flushed into the ocean, Koda, now a blue tang, called out, "Thank you!"
"You're welcome."
On the next floor, the school of fish got dumped onto the floor and changed back. Melissa rubbed her bruised head and said, "Wubba lubba dub dub…"
499
For more fishy transformations, there's Tokoyami the flying fish, Yaoyorozu the clam, Mina the sea cucumber, Bakugo the tiny guppy, and Izuku the nuclear submarine. Nezu remains unchanged – he's got fish DNA in there somewhere.
