Overview
64 Shiki is a conditional self-buffing AR.
As 64 Shiki requires few enemy targets to keep her Damage buffs going, her use is somewhat limited. Her HP Shields are fairly small and you’d be better off bringing a proper hybrid buffer like P22 if you want HP Shields and Damage buffs. Even in optimal situations (1-2 targets), 64 Shiki’s DPS isn’t that impressive.
As such, 64 Shiki is not recommended for use.