Mika Returna (Fauster, lit. Cannonball Girl), is a playable character and one of the supporting protagonists, from Orie Ballardiae’s faction within a seemingly secondary protagonist faction called Licht Kreis, in Under Night In-Birth series, debuted as a playable in its update Exe:Late[st]. She returns in BlazBlue Cross Tag Battle as one of the Season 1’s DLC playable characters.
Young Mika Returna is a member of Licht Kreis, holding the rank of "Tenth Executor". She is a dear friend of Orie, and there is no force or being on Earth, human, In-Birth, Void, Re-Birth or otherwise, that will keep her from fighting alongside her. One fateful day, she accidentally broke a precious vase at Licht Kreis's HQ and was imprisoned as punishment, only for Mika to dig her way out of her cell with a spoon, steal a plane, crash it en route to Japan, and make the rest of the voyage on a homemade raft while fighting her way through the coast guard; so unwavering is her loyalty in Orie.
Mika's EXS ability, the EXS of Drive: Diesel, grants her the superhuman strength needed to wield her weapon of choice: a pair of massive gauntlets known as the Pachelbel Cannon. Using her gauntlets' rocket thrusters in conjunction with strong punches and powerful grappling moves, Mika is a Pint-Sized Powerhouse who is dangerous to approach.
- She is currently the only character who is not originating from her home series’ first release.
- Before her DLC release in late Season 1, she and Nine the Phantom are the two first late Season 1 DLC characters whose gameplay assets already in prepared for a test drive prior their finalized release.
- Mika has color palettes of the following characters: May (Guilty Gear), Carl Clover (BlazBlue), Labrys, Nanase (Under Night In-Birth), Yang Xiao Long, and Doomfist (Overwatch).