When actress Shiolo Kutsuna was first seen in one of the Deadpool 2 trailers swinging around an electrified chain weapon, it was speculated that she was playing Surge, a member of the New X-Men. But Deadpool 2 co-writer Rhett Reese clarified to Comic Book Resources that Kutsuna's character was just an altered version of Yukio, saying:
She's a super-minor character. The character's name is actually Yukio, an assassin --- but who's an adult assassin, so we just aged her down. She's such a minor character, we thought we could pretty much get away with anything.