I have read that Brazil could have joined the Axis in WW2 due to its Fascist dictator.
Getúlio Vargas was a rather... odd dictator. His policies would zigzag wildly between radical leftism/trade-unionism and fascism( after he became a full-fledged dictator in 1937, mostly fascism), yet he still allied with democracy in WW2. As I often say, if he had an ideology we could call it Opportunism. He just followed the mood of the time.
(Say anything you want about that but it
worked. The guy remained as leader of the country for 15 years, and after a coup ousted him from power, he
won the democratic elections against the guy who couped him. By a landslide.)
If by 1942 America has not joined the war(unlikely, but feasible) and Germany is doing a little better than OTL he would have no problem in siding with them.