The Vault

Her signature and the most used option: it fits her rotation perfectly, boosting the squad's DMG against the target when her EX Special, Chain Attack or Ultimate deals Ether DMG. The buff is short, so save her EX Special for the moments that matter.

Nicole's signature at S5 is usable. It gives 50% Energy Regen, and when her Chain Attack, Tremolo or Ultimate deals damage, it grants extra Energy plus 24% team DMG against the target. The downside is that it lacks ATK and the effect only lasts 2s, so you need careful timing.