I started out as a Noel player because the idea of "fighting guns" amused me. Also because she's hot
I then switched to Tager because I'm lazy and would rather do a 5 hit combo for a sizable chunk of life, rather than a 20 hit combo for the same. I also discovered my play style is definitely taking advantage of mistakes, and Tager is awesome at punishing. But I became a one trick pony in CT; I literally couldn't play anyone else except Tager.
So when CS came out, I vowed to pick up an alt. I had already made a list in my head on who I was going to try. As predicted, Mu-12 and Makoto were characters that really meshed with me, as they're both (hot) interesting and new. As a previous poster also stated, I too am a huge fan of boxing characters, so Makoto was a must. I picked up 12 so I can have a character that is capable of zoning, but can also have close combat competence if needed.
If Valkenhayn is anything like Slayer, I'm definitely going to be giving him a chance too.