Green098 on 23 November 2018
Three more characters are joining Mario Tennis Aces. Luma, Pauline, and Boom Boom will be added to the game in early 2019, the company revealed today.
https://www.youtube.com/watch?v=oiE4bmoXBkc
https://nintendoeverything.com/mario-tennis-aces-reveals-luma-pauline-and-boom-boom/