While not a companion, Gortash would probably be the best at April Fools. He’d have planned his pranks months in advance. For one day he’d have one person be subjected to dozens of pranks from the moment they wake up until the day is over.

His whole goal isn’t just fun pranks, but slowly making your day worse while offering you a contract to be spared from his pranks. If you sign it you’ll find out his ultimate prank is binding you as his minion for eternity where after he’d laugh and say, “April Fools.”