On DeviantArt fans can be found more easily but on Gaia they seem to be quite rare.
I started with the Knuckles mini series, then went over to the Knuckles comics and just read the Sonic comics later on because the Knuckles story arc continued there. Started the whole thing as a Chaotix fan and continued as a raving Brotherhood of Haven fan. When they disappeared out of the comics I nearly stopped reading them and only peeked into one once in a while to see if they returned and also to catch up storywise a bit but also the story itself I didn't like too much anymore and so I completely stopped with the newer comics and rather stick with the old ones that I still like.
I rather would have done Locke since he's my favourite Guardian but Spectre is the only one where an avi works without looking stupid. Well, at least he's my second favourite after all.