More notably, though, I think there's a well-sourced, interesting, informative article to be written about Valen - one that looks at how information about him is threaded through the series, one that looks at how the series changed shape when the character who turns out to be Valen is written out at the end of season 1, one that uses the copious comments given on the matter by B5's creator, etc. It's something that a really, really good article could be written on. But not one that's organized with the intention of hiding spoilers.
-Phil
As a side note: Someone already mentioned this, but Valen isn't a minor character in B5 canon.
I too would love to see a really good Valen article.
Cheers, Erica