Well, had the feeling I want to add several more Umineko characters.
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Name: Bernkastel
Nickname: Witch of Miracles
Age: 1000+
Gender: Female
Abilities: Red Truth and Blue Truth usage, as well as basic reality warping magic. Bernkastel is a true mastermind to manipulating people to her bidding or her own amusement, having no feeling when hurting others. She can wield a scythe, like her piece Erika, and can summon her "cats" to do the brutal killing for her.
Species: Witch
Appearance:
[img=http://data1.whicdn.com/images/8489821/large.jpg]
From: Umineko no Naku Koro ni Chiru
Other: None.

Name: Lambdadelta
Nickname: Witch of Certainty
Age: 1000+
Gender: Female
Abilities: Red Truth and Blue Truth usage and basic reality warping magic. Apparently, if you do manage to tear her apart (she's immortal, she'll live :P), you can see that her entire body's insides is just cotton candy and marshmallows.
Species: Witch
Appearance:
[img=http://i01.i.aliimg.com/img/pb/361/571/432/432571361_542.jpg]
From: Umineko no Naku Koro ni Chiru
Other: N/A

Name: Beatrice
Nickname: Endless Witch, Beato
Age: 1000+
Gender: Female
Abilities: Since she is the Endless Witch, Beatrice has the ability to "endlessly" revive someone, multiply a certain item more than infinity, and weave new "gameboards" for games to be played. She also uses the Red Truth, Blue Truth, and lastly the Golden Truth due to being a Gamemaster alongside Battler. She also knows magic that would bend reality's limits.
Species: Witch
Appearance:
[img=http://i620.photobucket.com/albums/tt285/aquamarineAngel-tan/Umineko%20no%20Naku%20Koro%20ni/ee8b2376f05cda3a3c7565c187efdfa33c0.jpg]
From: Umineko no Naku Koro ni
Other: Beato is known to be in a relationship with Battler.