Urban Fantasy

Gay
Vintage: A Ghost Story by Steve Berman

When Ryan Came Back by Devon McCormack

Hybrids: Arrival by Chris O'Guinn

Bisexual
Unspoken by Sarah Rees Brennan

Wicked Lovely by Melissa Marr (note: neither bi character is very prominent in this book TheGayYA)

Ink Exchange by Melissa Marr

Fragile Eternity by Melissa Marr

Radiant Shadows by Melissa Marr

Darkest Mercy by Melissa Marr

Grasshopper Jungle by Andrew Smith

Asexual
Guardian of the Dead by Karen Healey