Oriko Mikuni

Great for Magia Building

Oriko's connect increases the amount of MP gained from Accele discs and her magia restores her own MP which makes her well suited for any magia-based teams. At 5 stars, Oriko's connect also gives Critical hit chance which makes her more useful overall. Her magia also gains the ability to grant Oriko guaranteed evasion for a turn, making up for her low defense.  Her personal memoria draws her own discs, guaranteeing a Puella combo and a connect on the next turn.

Glass Cannon

Oriko's high attack stats are negated by her low HP and defense, making her every bit the glass cannon. Since she hasn't been uncapped in the NA yet, her connect and magia aren't as great as they could be. She also has only a single Blast disc, so she won't be able to clear the field of enemies that easily unless it's her magia attack.

Good MP building

Oriko has high attack stats which are always an asset in Mirrors. She'll also be able to spam magia attacks provided you equip her with 4 memoria slots and lots of MP gaining memoria.

However, once Oriko is uncapped to 5 stars, it's possible to run a single Oriko in mirrors thanks to her magia restoring her own MP and guaranteeing evasion (much like Tsuruno Yui).

Average unit

Her stats are fairly average as far as common girls who have/will be uncapped goes. She has only a single Blast disc and magia damage is slightly nerfed in Mirrors. Her light attribute is both an advantage and a hindrance, since she deals neutral damage to elemental types and is weak when being hit by dark damage.

Her personal memoria has a 13/15 cooldown rate so it won't be usable here.