There are tons of muscular vegans all over the world, whether they are online or famous or not. I know, because I've spent the last 7 years on tour. Even in my book talks, I've signed books for 260-pound, build like hell, guys. I've also met some buff and ripped women.
They really are out there, even if we don't see them online much. I know you see me a lot, Derek, Ed, Jimi, and others who tend to spend a lot of time online or have their own websites or programs, etc. but there are plenty of others.
Here's a pic of Vegan Essentials, who posted above. I've hung out with him in person for years, including about 2 months ago, and he's a massive dude, even though he's slimmed down, as he said.
Here's another vegan guy who I've communicated with online:
And there are truckloads of others all over the place.
There are a bunch of big guys here: http://www.veganstrength.org/
Outside of North America, there are a ton of huge European vegan guys, a bunch of Big Aussies and plenty of others elsewhere too.
I'll start a new thread for fun, which I can update regularly, posting pics of Buff Vegans for anyone to refer people to anytime
All the best!