Sakura Matou OBD
Senpai

Name: Matou Sakura
Origin: Fate/Stay Night
Gender: Female
Classification: Mage, The Black Grail, Avatar of All Evils in the World
Age: 16
Powers and Abilities: Shadow manipulation, nigh-inexhaustible source of magic from the Holy Grailabsorption, corruption, can drag people inside her shadow where she can toy with them to her likes, soul consumption, can summon shadow giants with power equal to a Servant to fight for her, teleportation via her shadows, use shadow tentacles that harmsspirits, corrosive touch that breaks things down to their constituent particles and converts it into more magical energy, regeneration (mid), can call Angra Mainyu with prep.
Weaknesses: The Grail gradually corrupts her mind as she absorbs more souls. Overconfident. Sadistic and enjoys torturing her opponents.
Destructive Capacity: Building+ to town level+, life wiper with the rebirth of Angra Mainyu.
Range: Varies (depends on her state and how long she extends her shadow, potentially city-wide range)
Speed: Average human, her reaction speed is much higher (has attacks that can tag Rin or even hypersonic Servants, Sakura was confident she can beat Rider in straight combat)
Durability: Building level, regeneration makes hard to kill her
Strength: superhuman (can plunge her own heart out)
Stamina: Nigh-inexhaustible (has almost one trillion units of magic energy, opposed to the 25-100 for average magi)
Standard Equipment: Dark Saber, Dark BerserkerHoly Grail (with Angra Mainyu), numerous Shadow Giants
Intelligence: Ordinary school girl with limited mage training.
Notable Attacks/Techniques:

- Cursed Boundary Layer: An extending dark layer of shadows around Sakura. This is the combination of her affinity with Imaginary Numbers (shadow), the Matou family magecraft and the power of Angra Mainyu. It has a plethora of functions like teleportation, absorbing magic power, deconstruction of matter to pure magic power, binding spirits, repairing damage done to her, summoning shadow monsters with a will of their own or dragging people down to her own realm. Sakura's element is notably the best against spiritual beings like Servants. Her magic only works on humans because of its ridiculously strong output. The shadows casually overwhelmed Saber's magic resistance and corrupted her easily to be Dark Saber. Due to the influence of the Grail her magecraft is the imitation of the Third Magic, Heavens Feel. As such she can absorb and toy around with souls, even turning them into like a motion engine to generate magic power.

- Shadow Giants: Sakura can immediately summon roughly 7-8 Shadow Giants to her protection. Each giant is made out of roughly 1000 units of prana (note: that's Saber's remaining storage of power in her weakened form we mostly know in F/SN) and claimed to be as strong as a Servant. They're rather lacking in feats but presumably they have the same properties as Sakura's shadow-based attacks. The Shadow Giants act independently from Sakura's thoughts but take her aims and well-being as their prime directive. There's no known limit for the number of Shadow Giants.

- Angra Mainyu: The infamous All Evils of the World Angra Mainyu is a vengeful spirit imbued by all the hatred of humanity. He's a creature residing inside the Holy Grail and the reason behind its corrupted nature. He was once a Servant called Avenger in the 3rd Grail War and now the "Servant" of Sakura. Angra Mainyu is using her as a vessel for his resurrection. Once manifested in a physical form, the magical power was said to be enough for instantly obliterating Fuyuki City and soon ending the history of Humanity. In Hollow Ataraxia Angra Mainyu is a little different and showed abilities like possessing people, reversing time and calling a massive army of shadow monsters.

- Shadow Tentacles: Black muddy tendrils that originate from Sakura's layer of shadow. These tentacles are powerful enough to severely damage the walls of the Einzbern castle but more importantly even small contact with these cause severe burning pain that can immediately rob normal humans from their mind. The tentacles also drain the life-force and magic power of the opponent plus aid Sakura to drag her victims down into her shadow dimension. Like her other attacks, the shadow tentacles are exceptionally strong against spiritual beings like Servants.

- Dark Prana Bomb: Blob of dark mass of magic power that can be summoned from any shadow in Sakura's range. In appearance these are similar to a huge water balloon which is about to explode from the excess energy. Upon detonation it releases a blast of corrupted prana in all directions.

- Void blast: Reduces everything in a certain area to its constituent parts.

Notable OBD Victories:

Alucard (Hellsing) - Alucard profile (Note: it was per-Schröedinger Alucard)

Notable OBD Losses:

Gilgamesh (Fate/Stay Night) - Gilgamesh Profile
Jedah Dohma (Darkstalkers) - Jedah Profile (She was teamed up with Naraku. They lost anyway)

Other: Not to be confused with the similarly named Naruto character.

Sakura Matou OBD
Dark Sakura