I dunno, I like Shanoa.
I mean Soma is right up there peronality wise with Alucard, except he seems to be a little more friendly (He's pretty nice to every new person he meets in Aria except Alucard but then if I ended up in who knows where, my friend is knocked out and some guy shows up out of know where, I wouldn't be pleased either...) and gets upset a little easier. He doesn't really stand out in Aria until "OMG...HE'S DRACULA? Technically?!".
And in Dawn, he was just...meh. Again, he didn't stand out at all and he seemed to be a bit more serious than in Aria. So honestly, I'm indifferent to Soma.
Johnathan just comes off as the generic "overconfident anime hero who actually has underlining self doubt". I couldn't take him seriously, but then again, I couldn't take the story that seriously given the Saturday Morning Anime feel it had.
And Shanoa..again, her personality itself doesn't stand out (except she's more robotic in Alucard) considering she's very serious, just like Alucard. The only difference is her reasoning behind it, which almost makes you wonder what she's like with emotions. I mean we saw her at the beginning but she was about to do something crucial so her being serious made sense.
But then again, out of the three games, I like OoE's story better so. :shrug: