Board Thread:Theories and Speculation/@comment-36342497-20180726162715/@comment-25122992-20180801181215

It's quite simple, actually: if the character didn't demonstrate or said to be capable of certain ability, there's no basis to think he can use it. So, Mei is not a Mud Release user unless it'd be stated otherwise. So far, she's only a user of Lava and Boil Release KKG.