Iris was a female dragon that was getting auctioned to be sold to villains, she was in a full auction room being bid on when she saw undercover pro heroes in the crowd.

Villain: “Alright, let’s start the auction, first, we have Iris, she is a female dragon with multiple quirks! Any bids?”

she was trying to get free.

Aizawa: “There she is..”

there were also miruko, endeavour and hawks