Just to give you a heads up that I'm not entirely bitter about this subject, here are some types perfect for a harem of Males.
Honorable Mentions
The One Hell of a Butler Type
Sebastian Michealis from Black Butler
The Mysterious Thief who will Steal your Heart Type
Jing from King of Bandits Jing
The Soft Centered Tough Guy Type
Kanji Tatsumi from Persona 4
10. The Sharp Dressed Casanova who Treats you like Royalty Type
Sanji from One Piece
Leo from Fairy Tail
They are the lovestruck suit wearing chivalrous knights of the modern age. You'll definitely feel like a pampered princess from one of these two lovely men.
9. The Casanova who has the Domestic Skills to back Everything up Type
Brock from Pokemon
Say what you like about Brock and his constant attempts to attract women, you actually look at all the life skills he possesses it'll be stupid to say no. He actively enjoys household chores, breeding animals, can cook really well and is a qualified vet by Pokemon standards, to top it off he'll happily shower you with love. You may want to take this guy seriously next time you see him flirt.
8. The Nice Guy who Can't Catch a Break Type
Mousse and Ryoga from Ranma 1/2
Ranma 1/2 is very cruel to side characters, particularly when it comes to male characters, both Ryoga and Mousse are strong in their own right and are genuinely more caring about their target love interests than lead character Ranma who I already discussed last time as a little bit too good at being a woman. So I say give these guys a chance.
7. The Perfect Partner in Crime Type
Isaac Dian from Baccano
When pursuing a lifestyle of crime, particularly as an eccentric thief, it's important that your partner shares that personality and Isaac and Miria go hand in hand, but what really makes Isaac such a good partner is protecting his lady from being arrested, because that way you'll know they'll be waiting for you when you come out.
6. The Ill at Ease Fighter who's Confession Turns him into a Real Knight in Shining Armour Type
Domon Kasshu from G Gundam
The title sums it up perfectly, throughout a shows run the male lead character spends all his time fighting with the lead female watching but in the climax when the gloves are off, the male lead confesses his love and although it's very cheesy to do so it's also the most romantic thing you can ever do. It does lead nicely into the next one.
5. The One who will Smash your Face in for Making his Friends Cry Type
Natsu Dragneel from Fairy Tail
Although this is common for all members of Fairy Tail what makes me choose Natsu is when he did it for Erza. Remember that Erza is hands down the strongest female in the entire series so it's actually very touching when Natsu smacks Jellal so hard that he didn't even see it coming for making Erza cry and you'll know he'll do it again for every other member of Fairy Tail.
4. The One who Reforms because of Love Type
Harima Kenji from School Rumble
The story of delinquent Harima Kenji go from street fighter to Manga artist for the sake of love is special, it proves that you can change from the self destructive path to an honest one and even when he fails constantly he's still left with a better life and better outlook of the world than the one he started with.
3. The One Who Stays with you Despite the Constant Dangers Type
Gourry Gabriev from Slayers
There are plenty of candidates for this one but Gourry takes it because of the fact that compared to Lina Inverse who can survive deadly encounters with the most powerful demons in the world, Gourry is just a normal swordsman, yes his sword is special but still a swordsman none the less and his dedication in staying with Lina through thick and thin and going as far as to chase down the Golden Lord of Nightmares just to get Lina back is something no normal companion would do.
2. The One who Makes you Feel Loved when no one else does Type
Minato Namikaze from Naruto
Naruto as a show has a lot of shortcomings but they created someone special when Minato's backstory with Kushina was shown. Kushina by anime standards was not a stand out child, slightly chubby, hated her red hair and had a tendency for occasional violence, so when she got kidnapped, the only person who came was Minato, because he noticed Kushina's beautiful red hair; the one thing Kushina hated and it saved her life because Minato noticed her. Doesn't that make you smile?
1. The Genius who can make this Crapsack World Bearable Type
Shiroe from Log Horizon
This is number one because this is the person I want to be. Life is hard and there are a lot of people who make it harder but occasionally you get the one person who can make it right again, and while he won't be popular with everyone for it, you trust him because you know he helped you in the past and you know that the changes he makes will lead to something better and you're willing to stick by his side to make sure that happens.