Overview
MP7 is an Evasion self-buffer SMG, with a reasonable uptime and acceptable multiplier.
While MP7 does increase her survivability through her Skill, there is simply no reason to raise her as RO635 is given for free from Story Chapter 7-6 and late game options are centered around strong Mods.
MP7's Login SPEQ removes some irrelevant debuffs and makes her attacks that hit reduce enemy Damage by -1 each. Due to SMGs atrocious Accuracy, the very low duration and only applying while the Skill is active, this really doesn't do anything useful. MP7 remains not recommended for use.