It's
Yukari Yakumo from the shooter Perfect Cherry Blossom, if you manage to unlock Phantasm, which I did.
+ final attack:Yukari's Arcanum "Danmaku Bounded Field"
This boss has 20 forms, yes you heard it, 9 Non-Spell Card forms and 11 Spell Card forms. Which other shooter does this? And the attacks are awesome, requiring different skills in each form, which means pure adrenaline until the last form (if you ever reach it, that is).
You got knives, butterfly spirits, arrow head bullets, crystal shards, round bullets, medium round bullets, big bubbles, laser blades, laser mesh in any constellation and color.... illusions, confined space, time trick, fanning, spinning, bursting, buck-shotting, alternating, waving, dancing, exploding, disappearing, reappearing... you name it, she got it.
Too bad, most of you won't even know what I am talking about.
Jam it back in, in the dark.
85242
35212
Djinova