These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Acceptable Targets: Catholics. It doesn't help that the only representation the Catholic Church has in Hellsing is Iscariot, which seems to be made up of a bunch of murderous lunatics and complete bastards. Although to be honest, both Catholics and the Hellsing's Anglicans are portrayed here as fanatical, from a Japanese POV.
Generally, the former is for artificial vampires who threw away their humanity simply to get stronger, something Alucard detests. They're generally rather arrogant themselves, so Alucard wants to knock them down a peg. The latter personality is reserved for the few who (initially) seem strong enough to actually kill him and justify their vampirism or humans like Anderson, who Alucard believes have the right to kill him.
The Major may be a Death Seeker. He claims he wants to kick start another World War, starting with destroying London and then moving on to Paris, Rome and the rest of the world. However, he clearly has no idea how to deal with Alucard and sends many ranked underlings to their death against him. He knows he can't attack London as long as Alucard is there to stop him, but his grand plan for dealing with him is put him on a boat to buy a few hours. His only effective gamble to actually be rid of him is Schrödinger who he doesn't use until the very end. It doesn't kill him either. In other words, he fully expects they are all going to die, but he doesn't want to bum his troops down with that info. His true goal then is not to start a new war, but to go out in a blaze of glory, since he's Genre Savvy enough to see that either Hellsing, Iscariot, or Alucard will ultimately defeat them, especially since Mina Harker has run dry as a source.
The leader of the 'Last Battalion'' of the Nazi remnant Millennium, The Major is an unassuming, jovial fat little man who has one defining characteristic: his love of war. The Major, after surviving World War 2, consolidated his forces in South America where they awaited their chance for one final, glorious combat. Acting behind the scenes, the Major had multiple humans turned into vampires, having them slaughter innocent people to slowly reveal himself to Hellsing. Finally taking center stage, the Major launched an attack on London, obliterating everything he saw and having his men slaughter every living thing in sight, including babies. The Major confesses there is no end goal for it: the means of combat and war are their own end. The Major shows no hesitation in killing one of his own officers when he objects to the Major carelessly sacrificing their soldiers, and his ultimate goal is to die at the conclusion of his war, after having created one last great display of carnage he so loves.
Zorin Blitz lays siege to the Hellsing mansion with her forces and mind rapes Seras by delving deep into her memories and forcing her to relive her painful childhood, where she had to watch her parents be murdered by gangsters and her mother's corpse being raped. While Seras is trapped in the illusion, Zorin hacks off her arm, stabs her through the back, and cuts her eyes. Pip and his two remaining squad members arrive and manage to temporarily disable Zorin by shooting her multiple times. Pip tries to escape with the badly wounded Seras, but Zorin kills him by stabbing him through the back with her scythe. To top it all off, as Seras cradles his dead body and cries for him, Zorin mocks Pip, calling him an "insect", and prepares to kill Seras and her fellow soldiers. This was enough to provoke Seras into absolutely curb stomping Zorin and her forces to death and pulling a No-Holds-Barred Beatdown on Zorin by scraping her face against the wall at superhuman speed until her head remains as nothing more than a red smear on the wall.
Whatever this piece of music is called, which is also used in OVA 6 as Maxwell laughs insanely at the helicopters departing for London. Incredibly oppressive and creepy. Serves to underscore the sheer inhumanity and facelessness of both Millennium and Iscariot.
"Funny Aneurysm" Moment: Seras' embarrassment over Alucard asking if she's a virgin and comedic overreactions to Captain Bernadotte’s and the Wild Geese’s "Sexual Harassment" can become a lot less funny when it's revealed her mother was killed and then raped right in front of Seras when she was a small child. She freaks out about sex due to childhood trauma.
Like You Would Really Do It: Did ANYONE seriously think Hirano would kill his main trio of Alucard, Seras, or Integra? Only them? Pip wasn't a goner, he returned with improvements. Every major character in the Hellsing organization except Walter, who was a traitor, survived.
"Meanwhile... Alucard is still on a boat." note Alucard is absent during much of the invasion of London from episode 5 until episode 8, due to being stuck on the damaged aircraft carrier Eagle.
Memetic Sex God: Alucard, no kiddin'. It alternates with his vampire-sex god title. Alucard achieved this status by the time we see him in his Bondagecardform. Also, if you bring up Rip Van Winkle, the subject will automatically go to her interesting "battle". Even Alucard's voice actor declared that he has never played a character with such a powerful sexuality.
Seras, since she designed with fanservice in mind, and is also a vampire.
Mind Game Ship: Alucardxanyone, really...but AlucardxIntegra and AlucardxSeras tend to be fan favorites.
AlucardxRip is nearly a canon one — what with him screwing around with her and then taking a looot of pleasure in massacering her.
Moral Event Horizon: Chances are somebody in the series crossed it. Nazi vampire eating a baby? Alucard torturing Rip Van Winkle? Zorin mutilating Seras and killing her love interest? Maxwell ordering the deaths of innocent civilians? Take your pick.
Alucard's odd behavior while killing Rip Van Winkle may actually be farther away from a Moral Event Horizon than the other picks, because not only is this identifiable but when Alucard showed up again in Volume/OVA 8, we see his redeeming values.
If Zorin slaughtering the Wild Geese wasn't enough, she manages to cross it AGAIN with her Mind Rape of Seras with memories of her Nightmare Fuel past traumas and killing Pip. She paid for it though dear gooddid she pay.
Ron the Death Eater: Iscariot members are over villainous in fanfiction. Mostly due to Shipping: Anderson sometimes is turned into a rapist to create Wangst for the Alucard pairing of choice (even in canon, Anderson was disgusted to the idea of even manhandling Integra against her will). Integra is also victim of this in the hands of Alucard/Seras shippers, when she's not assumed dead in the beginning (or married to someone else), she's made a Soap Opera villain. Pip is sometimes pictured as a Romantic False Lead.
Rooting for the Empire: Some fans wanted Anderson or Walter to defeat Alucard, if only because of the enormous amount of effort they go through to match his strength. Anderson throws away his humanity and sacrifices his followers only to lose when Seras causes Alucard's second wind. While Walter becomes a vampire, goes through an operation to make himself younger and attacks relentlessly to keep Alucard from regenerating, only to be fooled by Alucard's shapeshifting abilities.
Ship Mates: Some fans will pair off the entire cast like it's Noah's Ark.
Shocking Swerve: A couple things, namely Walter becoming a vampire and betraying Integra.
Special Effects Failure: While the actual animation is top-notch, some of the CGI used in the OVA is less than stellar. Some shots of the Millennium troopers and Alucard's army of familiars in OVA VIII look awful.
Squick: Seras' flashback, has one of the robbers (in the manga, they were either hired by dirty copy on whose tail Seras' father was, or were the dirty cops themselves) that murdered her parents, raped her mother's corpse. That's wrong on any possible level and extremely disturbing.
It's very easy for new readers to mistake Integra for a feminine man.
What Do You Mean, It's Not for Kids?: For some unknown reason, the Dark Horse publication rated it as T for mild language and violence. Because the numerous times the word fuck is used is considered mild.
Nevermind the use of words like "fuck" and "shit", theres scenes of extreme Gorn everywhere and two rape scenes.
Heinkel really had it rough, even compared to the other characters. And in a series like this, that's really saying something. Her teacher, Alexander Anderson, gave up his life, in vain nonetheless, to try to defeat Alucard. Then, after his corpse was stomped on by Vampire!Walter, Yumie, in a blind rage, tried to rush him, only to get cut to pieces. Then, as she tries to avenge Yumie, she gets half her face shot off by The Captain before getting one shot in. Then, as it seems The Captain is about to finish her off, to which she'd be much better off as at this point, he refuses to and pities Heinkel by giving her bandages to wrap her face in, which she took as a huge middle finger to her entire cause. So, all in all, she lost her teacher, her best friend, half her face, and her pride.
Ironically, given the type of person The Captain is, it probably wasn't pity.
Jerkass Woobie: Rip Van Winkle for some fans due to how cruel her death is, and the implication that whole reason she was sent was just to distract Alucard, otherwise she would have been just another villain.
The anime made Alucard more noble than his manga counterpart — he only turns Seras after explaining his entire plan to her, instead of shooting her first and then asking if she doesn't want to die afterwards; and his bond with Integra is much more voluntary on his part, submitting himself to her after she displays her courage rather than because of the blood pact with the Hellsing clan.
There's some hints in briefest moments of a single flashback that implies Anderson didn't willingly become a regenerator, but it's never expounded upon.
Awesome Music: The TV anime's soundtrack is one of its very few aspects that's still praised.
Broken Base: Some fans love the TV series, some think it sucks. Points in favor of the series are that it fleshes out Seras a lot more as a character and explores the method by which the artificial vamps are made. Points against it? Well, "Incognito" wasn't quite up to snuff compared to the manga-original villains.