Overview
Five-seven is a Rate of Fire and Crit Rate buffing HG, increasing her allies’ Rate of Fire and Crit Rate with her Skill.
A HG’s effectiveness is based on their Skill effect combined with their tilebuffs. Five-seven’s Skill and tiles are both effective at what she tries to do. While Five-seven is effective as a Rate of Fire buffer, her Crit Rate is harder to get full use out of in general content, making Stechkin the more recommended option. As such, Five-seven is optional, but by no means bad.