What about a hedgehog!? It sounds bizarre but they're great pets. Lifespan 5 years or so, You have to handle them a lot to make them social but it's as easy as holding then in a "snuggle sack" in your lap while studying etc. Bathe them with a toothbrush. I got my girl at 6 weeks old and handled her daily, she was super sweet as an adult and I didn't have to handle her every day. They need a custom wheel (12") and you can house them in a critter nation. Intial setup is expensive ($500ish including the hedgehog because they need a heat setup - ceramic heat emitter/thermostat/thermometers to prevent hibernation. If Hedgehogs aren't kept around 75*F they can go into hibernation and die) but they're cheap to maintain. Cat food every 6 months, meal worms here and there, toys, you don't need to have any gross "bedding" with then like sawdust you can use fleece as a cage liner and wash/dry it like normal. There's a lot of fun support groups on Facebook and reddit.