Update: Two new playable Blades are coming to Xenoblade Chronicles 2’s Challenge Battle Mode.
According to Nintendo’s announcement at E3 during Treehouse Live, both Shulk and Fiora will be playable Blades in the aforementioned mode. In Challenge Battle Mode, players will complete various challenges and get new items and treasures as a reward.
Shulk in Xenoblade Chronicles 2, via Nintendo on Twitter
Source: IGN.com Xenoblade Chronicles 2 DLC and New Mode Revealed