Well, it's not a love triangle, but it's one of those complicated, messy situations.

I'm calling it right now (and I'd love to see it) - Cassie Cage and Kano's supposed son.

To me, the most interesting would be Chameleon, Khameleon and Reptile. Think this could be the only genuine 'love triangle' and can't think of any noteworthy in previous MK's, although you could create 'love triangles'. Might be foolish but maybe Rain, Kitana and Liu Kang (going by aspects of MKDOTR). There was always characters in normal relationships like Kotal Kahn and Jade, Shao Kahn and Sindel etc. that weren't in trio's, involving a third. Saying this, Shao Kahn could have had loads of women on the go. Don't think they're really needed, when you can have different types of interactions.