Not as overpowered as B. Battler because of the amount of power used for each of her form's personality, appearance, and abilities all stored in a girl's (or boy's) imagination.
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Name: Lion Ushiromiya
Nickname: Sayo Yasuda, Shannon, Kanon, Gaap, Beatrice, Clair Vaux Benardus
Age: 19 (pretends to be 16)
Gender: Biologically Male, Raised Female
Weapons/Gear: As herself, Yasu happens to be equipped with a few knives and a pistol.
Abilities: As herself, Yasu is an experienced killer. As Shannon, she is able to create barriers of red energy that are hard to take down. As Kanon, he can summon a blade of red energy to fight. As Gaap, she can summons black warp portals, but they only appear on a surface as it cannot be used on thin air. As Beatrice, she is able to use the Endless Magic, but due to this dimension, she is unable to call upon her furniture or even use the Truths. As Clair, she is gifted with certain details of the future, but at the price of her soul being tired out from each usage. Even if these are different forms, Yasu can still die normally.
Species: Human (her other incarnations are sorely based on her imagination, but she can appear as them due to the Illusion of the Witch)
Appearance:
[hider=Yasu][IMG=http://24.media.tumblr.com/5313514f1335c002411ce78498392d5c/tumblr_mwzrvbAIo31sq6x6wo1_500.png][/hider]
[hider=Shannon][IMG=http://img2.wikia.nocookie.net/__cb20111112015425/umineko/images/e/e7/Shannon4.png][/hider]
[hider=Kanon][img=http://jackshippo.files.wordpress.com/2009/09/umineko0801.jpg][/hider]
[hider=Gaap][IMG=http://img4.wikia.nocookie.net/__cb20111219200336/umineko/images/0/08/Gaap3.png][/hider]
[hider=Beatrice][IMG=http://img2.wikia.nocookie.net/__cb20120927163134/villains/images/5/52/Umineko_no_Naku_Koro_ni_Majo_to_Suiri_no_Rondo_Beatrice.png][/hider]
[hider=Clair][IMG=http://img2.wikia.nocookie.net/__cb20120127222512/umineko/images/0/0e/Cur_a11_houshin3star.png][/hider]
From: Umineko no Naku Koro ni
Backup: None
Other: When in worlds where her powers are limited, Yasu can only shift into the forms of Shannon and Kanon, and those abilities are halved in energy usage.