Here’s my Mighty Protectors take on the silver age Blob, who appears as a villain for the first time in X-Men #3.
For the Blob’s “cannot be moved once he sets his feet” ability, I used Physical Ability I) Wall-Crawling, with two modifiers: it takes a phase and his feet must be touching the earth. This means he can’t use it like Spiderman does to crawl up the sides of buildings.
Image
Blob and X-Men are trademarks owned by Marvel Entertainment
Superhero RPG Musings 