Moving on to the next list and no prizes for guessing that this is the worst females in a harem list.
Honorable Mentions
The One who means well but will Likely Kill you with her Cooking Type
Mizuki Himeji from Baka + Test
The Emotionless Girl who's only Facial Expression is Blank Stare Type
Nino from Arakawa Under the Bridge
The Constantly Pissed off One who takes all her Frustrations out on you Type
Akira Kogami from Lucky Star
10. The Workaholic who Chooses Career over Romance Despite being the Most Popular Girl Type
Ami Mizuno from Sailor Moon
Not that there's anything wrong with the decision only this hits harder knowing that I have been on the receiving end of this particular type of girl before.
9. The Socially Bankrupt one who expects Popularity on a Plate and then goes Crazy when Nothing Happens Type
Tomoko Kuroki from Watamote
Don't take your dating advice from dating games especially when it makes you look stoned from playing them too much, not made any easier by Tomoko's twisted take on reality.
8. The Bella Swan Wannabe Type
Yuki Cross from Vampire Knight
You're another reason why Vampires can never be cool EVER AGAIN!
7. The One who Forces you to do things for her Amusement and Destroys the World when she doesn't get her way Type
Haruhi Suzumiya from Haruhi Suzumiya
If you're going to give god a form, don't choose a form of a school girl who gets her kicks from bullying people into doing her bidding.
6. The Unstable Murderer Type
Diclonius from Elfen Lied
Any Female Character from Higurashi
Yandere Characters in General
There are some names within the two anime listed to run away from really fast, and I'm fully aware that the point of Elfen Lied is to sympathize with the Diclonius I just find it hard knowing that even when trying to help them my spine is probably going to explode in the process.
5. The Violent Tsundere Type
Houki Shinonono from Infinite Stratos
Naru Narusegawa from Love Hina
Taiga Aisaka from Toradora
At least a Yandere you can pin down to being mentally insane, Tsundere's know what they're doing and 9 times out of 10 there's no reason for the victim to be abused. Speaking of which the next two have similarities to this one.
4. The One who thinks her Title gives her the right to be a Complete Utter Bitch Type
Louise Francoise Le Blanc de la Valliere from Familiar of Zero
Louise takes Tsundere to another level and uses her title as another excuse for violence, what makes this worst is that she still ends up with Saito despite forcing him to sleep rough, making him her slave and hitting him for no reason. You know Japan there's a reason these characters aren't popular anymore.
3. The Psycho Lesbian Feminist who Hates you and Hits you for no Reason Type
Ume Shiraume from Ben-to
You can see a theme going now, while Ume has no business in a harem in the first place it still doesn't excuse her behavior towards men and equally her behavior towards women, she has some pretty sick ideas in her head and I had to purposely skip her focus episode because of it.
2. The One who takes Advantage of Your Kindness who then Dumps you for not being Good Enough to solve her emotional issues Type
Flay Allstar from Gundam Seed
The scary thing about this one is that this is the type of thing you read in gossip magazines and Jerry Springer Esque chat shows and none of them end well. While the Death of her father is a source for all of this that doesn't excuse her from playing emotional mind games with her targets and it only ends badly for her in the end.
1. The Crazy Stalker who goes too far Type
Ringo Oginome from Mawaru Penguindrum
This one takes the award for sickest individual female in anime. Ringo is obsessed with a teacher her deceased older sister was dating and is convinced by her diary and using the excuse of Destiny tries to win his heart, while the early stuff is Juvia level stalking it gets worst when she tries drugging, raping and killing him to get her way. Oh wait I forgot, the guy who made Utena did this show. Kunihiko Ikuhara you are one sick individual!