This Fighter, similarly to SP Mai GRN, can help the Team with some Supportive Unique Abilities. However, both of her PVP relevant Tags--Future and Female Warrior--have much better choices than her that can fill that role.
While her stats aren’t bad for an EX Fighter, she’s very fragile with Defense and low Health.
EX Mai PUR provides the Team with useful Buffs thanks to her Main and Unique Abilities. While these Buffs aren’t significantly powerful if taken singularly, they can add up to a 40% Damage Buff for the whole Team for a meaningful amount of timer counts, with an additional 20% to Strike Damage as well.
She’s an EX Fighter, so needs many good equips to hold her own against SP Fighters in PVP. Thankfully, Her Female Warrior and Future Tags give her many equip choices.
EX Mai PUR won’t last long against SP Fighters, especially due to her atrociously low Health and Defense stats. Considering that her utility revolves around Team Buffs, the fact that she’s such a fragile Fighter makes her inviable for PVP in most situations.
There are already many decent Fighters that cover her role in both the Future and Female Warrior Tags. SP Mai GRN basically does the exact same things as her but better. This means that EX Mai PUR would only be used by Players who don’t have her SP variant.
While she has seen some niche use, her weaknesses make the other choices much more preferable.
As with Female Warrior Teams, this Team much better Support Fighters than her even if they lack Purple Fighters. This Tag is powerful, still a little small. That being said, it doesn’t strictly require the presence of a Support Fighter in its Team Builds.
She’s solid Support for Female Warriors and really not a bad sub for Players who don't have SP Youth Bulma BLU since she Buffs Female Warriors both when she arrives and leaves--pair that with her many ways to reduce sub count, and she encourages fast-paced Combat that gets the most of Vanish Step and Synergy.