I'll definitely pass on the possum. Had one for a pet when I was a kid. Coolest pet ever. If you wanted to pick him up, you just put your finger under his tail... ftwap... that tail wrapped around your finger and you'd pick him up. Set him on your shoulder and he'd go sniffin' around, eventually ending with his snoot in your ear... then he'd slip you the tongue... Dang it, now I gotta tell the whole story.
Yada yada, north Missouri farm in the 60's. Lots of critters. Home rule was no critters in the house. Critters had the barn, humans got the house. No exceptions. Then Dad brought home a possum that wasn't much bigger than a mouse. He'd mowed hay thru a nest, and that was the only one left alive. We dropper-fed it for a month, then he ate Mom's oatmeal out of a bowl. At about half grown, he preferred grapes. He'd pick them up from the bowl with both front paws, then wash them in his water bowl before he'd eat them. Poss was the only critter allowed in the house, ever, but he was like family. After about a year, we let him go, and he made a nest under the porch. Shortly after, he had a girlfriend that he brought for us to meet. Then they were gone.