Montana Max is the main villain of the Tiny Toons Adventures series and is a recurring menace who varies from a simple-minded bully to a full-fledged supervillain depending on his mood: he is obscenely rich and proud of it, loving to use his wealth to better his own enjoyment while caring little for that of others. He is the nemesis of Buster Bunny in a similiar fashion as Yosemite Sam was the nemesis of Bugs Bunny - in fact Montana Max is seen as Yosemite Sam's main admirer in Acme University.
Despite his loud, bullying nature Montana Max was the focus of Elmyra Duff's manic affection on numerous occassions.
Montana Max's love of money is highlighted by the fact his doorbell rings out the phrase "Money!" when rang and despite usually being a high school bully he has also become a ruthless business villain in special episodes revolving around Plucky, who imagines himself as the eco-based hero the Toxic Revenger (a parody of the cult film the Toxic Avenger).
Montana Max is not only the nemesis of Buster Bunny but a rival to the entire Tiny Toons cast, it was revealed in one episode that Montana Max was originally to air his own show but he was so obnoxious that it was rejected in favor of the Tiny Toons (a case of breaking the fourth-wall): this enraged Montana Max and he's been causing trouble ever since.
He shares Yosemite Sam's explosive temper but is considerably smarter (at least sometimes) than his role model, he is also one of the few Looney Tunes villains that could be viewed as a regular threat to the heroes (though, like many things, this may be down to personal opinion).
As mentioned above Montana Max has often been pursued by Elmyra Duff and has sometimes returned the feeling, albeit reluctantly.