I liked Michael O'Hare's Commander Sinclair very much. It took me a while to warm up to him, as he was playing a cerebral and somewhat wooden figure (by direction, I suspect), but he was a great character. I loved the reveal; he pulled it off quite plausibly in his final two-parter.
Here's all the B5 actors who are already gone. I find this shocking:
- Richard Biggs (Dr. Franklin) d. 2004
- Tim Choate (Zathras) d. 2004
- Andreas Katsulas (G'kar) d. 2006
- Jeff Conaway (Zack) d. 2011
- Michael O'Hare (Commander Sinclair/V[SPOILERS]) d. 2012
Considering how long fans of Trek have been able to enjoy touching base with their mythological heroes' actors, Babylon 5 has had a very rum run. They were all so young.