I've been looking for a fic, but it's been a while and I can only remember parts and vague details, not enought to find on my own.
It had the main character, a SI I believe and possibily a Power Manipulator/Copier, span at least Worm and MLP and possibly more.
What I can really recall is just a specific part that's really sticking out to me is that when he ended up in MLP (comingfrom Worm), he ended up sort of taking over/absorbing a timberwolf threatning the Cutie Crusaders (or at least some kids) and protecting them. He kept absorbing nature/trees around him to grow bigger/heal from crossing over (while carrying the kids with him and protecting them inside him, like a giant walking treehouse), and soon became like some sort of giant walking nature turtle with multiple heads, at least for a while. He gets back to Worm, from what I can remember.
If anyone can narrow it or point it out, thanks!