Tolstar

Tolstar, the king of Stardust Fields, was a greedy trickster found in in the game Mario & Luigi: Superstar Saga. When Bowser got stuck in a cannon, Tolstar charged the brothers all of their Coins to keep the incident a secret. Mario offered up the coins, but they are all Mushroom Kingdom coins, and worth much less in the Beanbean Kingdom. Tolstar demanded 100 Beanbean Coins and the brothers had to search Stardust Fields for them. Upon collecting them, however, Tolstar still refused to set Bowser free and attacked Mario and Luigi.

In battle, he attacks by throwing spiked balls at Mario or Luigi, and even gives a hint by saying that remembering which hand he throws it with won't help them. After defeating him, the brothers advance to Hoohoo Village where they are accused of kidnapping Blablanadon by the Beanbean Guards. However, a beat-up Tolstar comes to inform the guards that the two are Mario and Luigi, that they are though and that they didn't kidnap Blablanadon.

Trivia

 * Tolstar may possibly be related to Spike, a similar-looking species of minor enemy that made its debut in Super Mario Bros. 3. They even share a similar attack pattern, with Tolstar coughing up spike balls and throwing them at Mario or Luigi.
 * Tolstar also bears some resemblance to Tubba Blubba, in Paper Mario, and Macho Grubba, in Paper Mario: The Thousand-Year Door.
 * Tolstar may not be evil, just incredibly greedy, so much so that he would go to any extent to get more money, such as Wario. This could be hinted due to the fact that he later helps verify the real Mario Bros.
 * The fact that Tolstar throws with both hands suggests that he is ambidexterous
 * His name probably derrives from the fact Tolstar forces people (such as Mario and Luigi) to pay a toll in order to get across the border.