I like Jeffery Donovan a lot as an actor, his looks don't really appeal to me but I tend to be interested in everything he's in.
Unconventional, unconventional...

Imai Hisashi, the guitarist and vocalist of "Lucy" as well as the guitarist and composer for Buck-Tick, which is one of Japan's longest lived visual kei bands. His looks aren't really that striking, but he has a very unique voice, and I'm a sucker for voices.
Lastly, sticking to the yummy voices trend, here's Gara from the band Merry. He's kind of skeletal looking, very thin cheeks, but I absolutely adore his voice. Here's a sample of Merry, but I warn you it's not as accessible as Buck-Tick, but I did go for a mellower song.
Unconventional enough for this thread?
Enjoy! (And yes! I have a crush on all of them, or at least have at one point in time. I have a lot of love to give

)