Your child tore through The Bad Guys and now wants the exact same feeling: a crew of animal misfits, a caper going sideways, and a joke on every page. Good news, there's a whole shelf of it. Any one of them scratches the itch on its own. Pick by what your child loved most about the Bad Guys, and hand that one over first.
The Bad Guys works because of a few different things at once, and a child usually latches onto one of them hardest. Each book here matches a different piece of what they loved, and any single one is a genuine 'more like that.' If it was the comic-panel format and the wall-to-wall jokes, start with InvestiGators, or Dog Man if you don't already have it at home. If it was the bumbling-secret-agent goofiness, Agent Moose is that joke in the woods, and Mac B., Kid Spy is the spy caper with a straighter face and a bit more text. If it was the crew of animal misfits on a mission, CatStronauts is a four-cat space team and The Chicken Squad is four chicks who appointed themselves detectives. Pick by the appeal.