favo Fusion? Opal. To me, Opal seems more the Pearl/Garnet fusion than Sandonyx is, but I still do love Sards for all she is.

I don't know, I just think that Opal's calm stoicness and how she sang back to Steven when they first met was something that Garnet would totally do to remind Steven that that its still them as well as Opal. 

[s]Plus I just love that entire scene with her killing the birds then smiling at Steven like kill me now[/s]

As for general characters? Of the CGs, Garnet, Peri is a close second

Of the Humans, Greg, then Jamie