Hey, so never one to turn her back on someone asking for feedback, I am your friendly neighborhood harem girl, here to tell you everything you are doing wrong and why you are a horrible RPer, but phrase it in a constructive way so I can feel good about myself afterwards! Sounds awesome right?
Jokes aside, I relooked over Serivin's character sheet, and honestly it is really well done. A LOT of content, but most of it is hidden in spoiler tags so it isn't overwhelming. With that in mind, there isn't a lot you can do on that front to make him more appealing, other than go crazy on the coding for him.
I think the problem you are having is less with the character itself, and more the nature of the site. As you mentioned in your post, most people are interested in FVF when they come to the site, and even the MVF matches like focusing more on the female characters rather than the male. In my experience, if you are having a male involved with a match, it's mainly either to job to a seductive domineering heel, or (and much more likely) to completely squash and destroy females in ways that would only turn phychos on. (Like myself. :p) When I think of the the more popular male wrestlers on the site, (Killer King, Lycan, Ivan,) all of them meet this latter role.
As such, I think the only real thing that can be done to make him more popular is to turn him into a more dominant wrestler. Maybe not turn him heel, but make him more of a nightmare for women who are facing him. Best way to do that I think is to give him some squash matches, and once he is established as a hard-core wrestler, then start fleshing out his character more with CD topics.
I think we were talking about possibly setting up a match with my Olivia, (sorry I'm getting dozens of RP request and trying to keep it all straight in my head is getting hard, along with keeping up with my other post and my creating ideas new characters) but I think that match, or against a few other jobers, might help alot.
These are just my thoughts while I'm in a doctor's office though, and more experienced LAW RPers might have different thoughts and opinions. So feel free to fish around for other ideas as well. <3