Grim fandango??
Zafina in Tekken
Ivy in Soul Calibur
I wouldn't really classify Ivy as obscure ... I think not a lot of people use her because she has a steep learning curve, but it's not like she's Talim or something
She's SC's definitive obscure character after Voldo, as her weapon and playstyle is obviously and totally unrealistic compared to the rest of the cast. Now Shut the fukk up.