I want a clockwork buddy for DnD as well!
Wondrous item, rare
The creature made of metal, cogs, and springs follows you around and does your bidding without question. As a bonus action you can command the creature. I has a speed of 30 feet and a climb speed of 30 feet. It has AC 10 and 10 hp. It as a move and an action each turn. It can not attack, activate magic items, or cast spells, but it can carry items up to 5 pounds and do any other actions such as administering a potion or handing items to other characters. If it takes enough damage to be knocked out, it repairs itself after a long rest.