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The point that I am taking Seras from is near the end of the OVA's/manga. She is a full fledged vampire under the Service of Integra Van Hellsing. Her outfit is also now red from absorbing so much blood.
+Seras like other Vampires of the Drakul line has immense super strength to the point the even before she was a full fledged vampire she could use heavy artillery usually reserved for three men at one and used to take down tanks with one hand.
+She also has super speed and reflexes as well to their logical extremes
+Her other powers/abilities include Regeneration
Advanced Marksmanship
Shapeshifting
Immortality
Invulnerability
Superhuman senses
Advanced Combat
Familiar summoning
Intangibility
Clairvoyance
+She managed to gain Alucard's respect at the end of the manga from her long years of service to Integra and becoming a full vampire, to the point were Alucard actually call her by her name instead of just police girl.
+Another ability whose presence is analogous to Anderson's 4-dimensional status is telekinesis, or more accurately tactile telekinesis. Despite having a slight frame and little weight, she has phenomenal lifting strength and load-bearing abilities, but her limbs come under none of the normal strain of such weight and such objects do not crumble when carried. Furthermore, extremely high-recoil and normally turret-fixed weapons afford no such problems to Seras, even though powerful muscles would afford her little help without a strong footing. In addition, her wings do not flap. Instead, she soars much like a bullet.
She can also absorb souls (or at least memories) carried in the blood of others. Her most dramatic power, however, is the use of solid shadows from which she makes a bat wing that emanate from the stump that was her left arm, allowing her to fly at enormous speeds and then later use it as a non-lethal weapon against Iscariot. Her overall power level remains under question; Anderson seems to regard her as a true nosferatu who still conceals herself in human visage and the Major calls her 'one of the fighters in the final tragedy of Walpurgisnacht'.
After becoming a true vampire, the stump of her severed left arm now produces a solid shadowy substance which Seras can manipulate into various shapes. She first forms it into a wing for flying, and she also used it in this form as a non-lethal weapon against a group of the Vatican's soldiers who were holding Integra "prisoner". In chapter 82, we see her forming it into an arm in order for her to be able to wield two guns at once, and in Chapter 85 it is shown that she can turn them into normal shadows, which snake along the ground similar to Zorin Blitz's tattoos and form them into sharp spikes for stabbing, lethal attacks. Her fully vampiric form might lack a human left arm, as it was severed by Zorin Blitz just before she became a true vampire.
Like Alucard, her transformation was completed upon her truly embracing her vampiric nature and brought about the enhanced effects and access to the higher-level powers; subsequent souls would thus serve only to increase her overall power level and regenerative abilities without changing the nature of her powers. For instance, 30 years after the Millenium incident, she has such control over her shadow matter that she can mimic Alucard's entire outfit by transforming it, but she still cannot shapeshift any part of her body besides her arm. The overall progression of her abilities and combat prowess is best depicted by the fact that Seras (with Pip's help), managed to not only do battle with the experienced Captain, Millennium's greatest soldier (besides Dark Walter) on nearly equal terms, but best him. Prior to drinking Pip's blood, Seras could not walk in the sun without a hooded jacket and overcast skies. However, after she does, she is able to stand sunlight and has a shadow, as depicted in Chapter 73.
+Seras, like Alucard uses weapons i battle. Her most used weapons and the ones she has on her at the moment are the Harkonnen and a relativly smaller rifle that fires 13.7 mm rounds.
-Might have inherited some of Alucard's arrogance when she became a full vampire.
-She is a lot nicer when compared to other vampires and some could see that as a weakness
-Can sometimes act quite child-like.