Crown's summary, from Reddit
Could be the next best support Nikke. Might surpass Liter. We know her skills now from the JP livestream, but we don't know the numbers.
Skill 1: When using Full Burst, provides ATK Up and Reload Speed Up to allies who participated in the active burst chain. Also, allies who didn't participate in the active burst chain, they get DEF Up and Reload Speed Up.
Skill 2: When a normal attack hits an enemy, applies an HP Recovery buff to herself. When she reaches full stacks, if she has the highest HP in the team, she'll consume all stacks, taunts, and become temporarily invincible.
Burst Skill: Provides ATK Up for all allies and applies a shield based on the casters final Max HP.