Ahh he's gorgeous, I love the quizicle looks on Guinea-Pigs faces. And how they love tunnels but would never dig one.
East I wanted a capybara. My reasoning is :like Guineas but bigger , they can snuggle up to the piggies and keep them cosy, I could take it for a walk like a dog but no offensive dog pooh.
Cons- they eat the bark off the trees and destroy them and they need a water pond so they'd swim and dry themselves on the cavies.
And they bite.