Solo is the human form, while Burai/Bly/Rogue is his denpa henkan battle form. Yes, he essentially serves as the rival in SF2. If you need comparison for comparison's sake, a combination of Blues and Forte, more or less.
There are more than enough Burai/Bly/Solo art pieces out there. And I'm sure there's more in the RnROCW, but my copy hasn't arrived yet. This is just a sampling of official art. There are plenty of anime screencaps out there. Head to On-Air
while it's still alive if you need to grab some:
Slur is also female, BTW, as Trance pointed out. More or less designed for Stream only, to hand out Asteroid Navis in the anime and be a rival for Forte while Rock had other business to attend to. She does Duo's bidding, and traveled with him on his asteroid of doom. REO
has all your screencaps for reference there.