It's been years since I've seen the film, but I remember enjoying it.

Yes, I agree on Clerith.

I remember back when I played FF7 for the first time I didn't even think Tifa and Cloud were interested in each other; I always chose the dialogue options that kept them separate.

The romance between Cloud and Aerith is certainly interesting, but I don't quite remember how it all went down. It may have been the case that Tifa was interested in Cloud, while Cloud was interested in Aerith, and Aerith was interested in the Planet, haha.

But back to Advent Children:

Yeah, I was just excited to see one of my favorite video games brought to life. Sephiroth was amazing, as always, haha.