L o v e ;
Sion has Dominique, Volt has Echidna...but what about good ol' Mugetsu? Who could be his match?
Well, I asked respectable Dr. Love about this, and here are the results.
Oh, and please don't take this seriously since I don't either, 'kay? My comments are in brackets.

MUGETSU x DAURAGON - 45%
The chance of a relationship working out between Mugetsu and Dauragon is not very big, but a relationship is very well possible, if the two of you really want it to, and are prepared to make some sacrifices for it. You'll have to spend a lot of quality time together. You must be aware of the fact that this relationship might not work out at all, no matter how much time you invest in it.
[Dauragon is actually the most common (okay, the only) person to get paired up with Mugetsu in yaoi. still, Dr. Love doesn't seem to really believe in their relationship. Well, you know what they say about boss-employee relationships. Mugetsu and Dauragon are so different, too - while Dauragon can only think of his revenge and world-domination, Mugetsu pretty much lives in the moment. Besides, Dauragon didn't hesitate to kill his master, so i bet he'd be violent and abusive towards Mugee, too. *protects Mugetsu*]

MUGETSU x DOMINIQUE - 58%
Dr. Love thinks that a relationship between Mugetsu and Dominique has a reasonable chance of working out, but on the other hand, it might not. Your relationship may suffer good times and bad times. If things might not be working out as you would like them to, do not hesitate to talk about it with the person involved. Spend time together, talk with each other.
[...Er. I really can't imagine Domi and Mugee having a relationship. For one thing, Domi is a whole lot younger. Secondly, Mugetsu really seemed to enjoy choking her. ;D Besides, Dominique already shacked up with that ninny, Sion.]

MUGETSU x ECHIDNA - 27%
The chance of a relationship working out between Mugetsu and Echidna is not very big, but a relationship is very well possible, if the two of you really want it to, and are prepared to make some sacrifices for it. You'll have to spend a lot of quality time together. You must be aware of the fact that this relationship might not work out at all, no matter how much time you invest on it.
[Okay, these two couldn't possibly stand each other, they're both way too cocky. Plus it seems that they're having some sort of a civil war for who gets to be #1.]

MUGETSU x KALDEA - 37%
The chance of a relationship working out between Mugetsu and Kaldea is not very big, but a relationship is very well possible, if the two of you really want it to, and are prepared to make some sacrifices for it. You'll have to spend a lot of quality time together. You must be aware of the fact that this relationship might not work out at all, no matter how much time you invest on it.
[Well, I'm not really that surprised - their personalities are so different, it could never work. Kaldea is caring and constantly sad, while Mugetsu is...well, homicidal. ;) They could've been a cute couple, though. Really.]

MUGETSU x KOU- 45%
The chance of a relationship working out between Mugetsu and Kou is not very big, but a relationship is very well possible, if the two of you really want it to, and are prepared to make some sacrifices for it. You'll have to spend a lot of quality time together. You must be aware of the fact that this relationship might not work out at all, no matter how much time you invest in it.
[...The exact same score as with Dauragon. Hmm. I guess guys aren't Mugetsu's thing. Anyway, Kou is a good guy, Mugetsu is a bad guy. That pretty much sums it up. Plus Kou's got a thing for Leann.]

MUGETSU x LEANN - 37%
The chance of a relationship working out between Mugetsu and Leann is not very big, but a relationship is very well possible, if the two of you really want it to, and are prepared to make some sacrifices for it. You'll have to spend a lot of quality time together. You must be aware of the fact that this relationship might not work out at all, no matter how much time you invest on it.
[Dammit! This isn't going well at all! >< Leann is way too serious for Mugee and seems like a person who couldn't stand the kind of havoc Mugetsu'd wreck. Plus they've never actually met. ;) ]

MUGETSU x PD-4 - 14%
Dr. Love thinks a relationship might work out between Mugetsu and PD-4, but the chance is very small. A succesful relationship is possible, but you both have to work on it. Do not sit back and think that it will all work out fine, because it might not be working out the way you wanted it to. Spend as much time with each other as possible. Again, the chance of this relationship working out is very small, so even when you do work hard on it, it still might not work out.
[......PD-4 is a robot.]

MUGETSU x SION - 46%
The chance of a relationship working out between Mugetsu and Sion is not very big, but a relationship is very well possible, if the two of you really want it to, and are prepared to make some sacrifices for it. You'll have to spend a lot of quality time together. You must be aware of the fact that this relationship might not work out at all, no matter how much time you invest in it.
[Sion has an unhealthy obsession with Dominique, need I say more? And Mugetsu tried to kill him (Sion and Dominique have something in common - they both have been choked by Mugee) ]

MUGETSU x VOLT - 88%
Dr. Love thinks that a relationship between Mugetsu and Volt has a very good chance of being succesful, but this doesn't mean that you don't have to work on the relationship. Remember that every relationship needs spending time together, talking with each other etc.
[Omg. oO What an unlikely couple. Well, they do know each other from before, so...I really don't see why not. An employee-employee relationship. XD Oh, and did you notice that while Sion could only think of Dominique and Kou just sorta made fun of him, Volt paid the most attention to Mugetsu?]

MUGETSU x WONG - 45%
The chance of a relationship working out between Mugetsu and Wong is not very big, but a relationship is very well possible, if the two of you really want it to, and are prepared to make some sacrifices for it. You'll have to spend a lot of quality time together. You must be aware of the fact that this relationship might not work out at all, no matter how much time you invest in it.
[...A drawing of Wong doing the famous Marilyn-with-her-skirt-blown-up -pose pops into mind. Ew.]

Well, Mugetsu doesn't seem to mind being a lone wolf, so I don't see why he should get paired up with anyone. It's okay to be single, Mugee. XD