Mei is an #overwatch climate scientist. She uses an Endothermic Blaster to freeze her enemies in place, or to erect walls of solid ice to block them. She can also encase herself in ice as protection from her enemies. Her ultimate ability is Blizzard, which calls down her personal and portable weather modification drone, the very cute Snowball, who can freeze all Mei's enemies within a wide radius. I'm thinking that Snowball could be put to good use this summer. It doesn't have to freeze anybody, just lower the temperature by about twenty degrees or so.