Now for a special set of lists because A) I've not done one for a while and B) It's a special super duper quadruple list featuring the best and worst types to have in a harem for both male and female characters.
We start with the worst types of males in a harem.
Honorable Mentions
The I Make a Better Girl than the Girl I'm Actually Dating Type
Ranma Saotome from Ranma 1/2
The You Look Like my Dead Sister so you'll be her Replacement Type
Tokiya Mikagami from Flame of Recca
The I have an Entire Class in my Harem yet I'm Young Enough to Get Away with it Type
Negi Springfield from Negima
10. The Doesn’t Know the Meaning of Personal Space Type
Ichiya Vandalay Kotobuki from Fairy Tail
Ever met those types who like to flirt with you but come across as really creepy? That's exactly what Ichiya is like and I can see why Erza is scared of him. Yes I did say Erza, the same Erza who can take down a hundred monsters by herself.
9. The I Always Travel with Different Female Companions and Ignore all of their Hints Type
Ash Ketchum from Pokemon
Makes me wonder if Ash Ketchum's cross dressing phase had other implications but in all seriousness he's on his fifth female traveling companion and the current one really does have a crush on him, does someone have to slap some sense into the guy but then again he's not just this but also number 8.
8. The Shonen Protagonist who is Oblivious to Love Type
Monkey D Luffy from One Piece
The sexiest woman in One Piece can't get the potential Pirate King to look her way. This is the same woman who under normal circumstances looks down on men so much that she looks up, yet when she does fall madly in love with Luffy, nothing happens.
7. The You’re Going to Die if you try to Date me Type
Any Gundam Pilot from the Gundam Franchise
If death follows you everywhere don't fall for the one who's creating the Death in the first place, this goes double if your love interests are from Gundam Seed.
6. The Over the Top Manly Man who likes Lolita Type
Adam Blade from Needless
Adam Blade is a big guy in terms of muscles, ego and personality, basically Kamina on steroids, so liking little girls doesn't bode well for the female cast of Needless.
5. The Doesn’t Realise he’s in a Harem Type
Ichika Orimura from Infinite Stratos
These are the ones that attract countless women of all types, the same ones who created the Harem Genre in the first place yet some are too stupid to know this. The only one who's excused from this is Hibiki from Vandread as he grew up in a world where the genders are separated but Ichika is just an idiot. Tenchi Misaki comes to mind as well.
4. The Stupidly Popular Angsty One who is really a Dick Type
Sasuke Uchiha from Naruto
He broods, he's stoic, he wants revenge, all the girls love him because they want to save him, he's basically Edward Cullen with a Ninja Headband, he's actually a dick, it's Sasuke Uchiha! Everyone who's ever tried to get close to this guy has been stabbed and yet Haruno Sakura still married the dick
3. The I’ll Use Your Feelings to further my Goals and Kill you when I don’t need you Type
Light Yagami from Death Note
While this is normally reserved for a metric ton of evil villains, Light Yagami is supposed to be the hero yet he cares so little for Misa that he'll happily kill her when he's done. Do you really want a guy who eats potato chips and writes in notebooks with as much subtlety as firing a handgun in public.
2. The I Like Fake Girls Better than Real Girls yet I have better Dating Skills than the best Dating Experts on the Planet Type
Keima Katsuragi from World God Only Knows
Oddly specific this one but understandable when you consider that Keima is a master troll at doing this sort of thing. Well done Japan, you've made the harem hero a troll worth punching.
1. The Any Male from Utena Type
Every Male from Revolutionary Girl Utena
Just try and watch this anime and try and understand how the men in that world function.
The words "Narcissistic and Proud" come to mind along with a few things that I'd rather not talk about, as I feel ashamed that males were designed this way.