Prince Peasley is the prince of the Beanbean Kingdom and the son of Queen Bean. He is the hero of the kingdom who helps Mario and Luigi during their efforts to stop the evil Cackletta. In fact, Prince Peasley is to the Beanbean Kingdom as Mario is to the Mushroom Kingdom; meaning that both of them are great heroes and famous celebrities in their native lands. (Luigi, on the other hand, is not that big of a celebrity; even Bowser cannot remember Luigi's name). Prince Peasley is also good friends with Princess Peach of the Mushroom Kingdom.
Peasley is a beanish with golden blond hair, wields a small sword, and flies around on a little winged bean. Although he is a heroic adventurer, he seems more concerned with showing off his hair and his smile (the former of which, in fact, can physically light up an entire room).
During the events of Mario & Luigi: Superstar Saga, Prince Peasley was transformed into the monster Dragohoho by the bean witch Cackletta. He was then sealed in an egg and placed at the top of Hoohoo Mountain. By eliminating the threat of the heroic prince, Cackletta could continue her coup of the Beanbean Kingdom without interference. However, Mario and Luigi travel to the top of Hoohoo Mountain, where they meet the pterodactyl Blablanadon. The dinosaur was incubating the egg containing Dragohoho, which then hatches in front of the heroes. The monster attacks the plumbers, but Mario and Luigi retaliate, eventually defeating the monster. As such, the monster transforms back into the bean prince Peasley. He introduces himself to the brothers and gives them Peasley's Rose, a rose that will let them into Beanbean Castle.
After Mario and Luigi defeat Cackletta for the first time, Fawful sucks up her spirit and tries to destroy the brothers, but is stopped at the last minute by Prince Peasley, who attacks Fawful with such force that he is ejected out of Woohoo Hooniversity's roof.
When the Beanstar shatters into four pieces and scatters all over the kingdom, Prince Peasley bets Mario and Luigi 99,999,999,999,999 Mushroom coins that he will find all the pieces before they do, and off he goes. Unfortunately for him, on his quest, he was swallowed by the Piranha Bean. Eventually Luigi, looking for Bean Fruits, finds the Piranha eating one of the precious Fruits. Luigi immediately engages him in battle, of course. In battle, one of Piranha Bean's moves is spitting out a small object at Luigi, then gobbling it right back up when it re-appeared on the other side of the screen. After the Piranha Bean's defeat, the object came out of the body, revealing itself to be a shrunken Prince. Luigi hammered him, which returned him to normal. In return, the Prince gave him the Bean Fruit. The Bros. eventually beat Peasley to his wager, but he kept to his word and gave them the coins. But is turns out that Peasley had bested them again, as Lady Lima revealed that at today's exchange rate, that much is only worth 99 Beanbean coins.
Ultimately, Mario and Luigi defeated Cackletta, despite the fact she commandeered Bowser's flying fortress, his troops, and his body. Once the witch's spirit is destroyed, Prince Peasley arrives at the castle, telling the plumbers that the castle will explode in three minutes. Mario and Luigi successfully escape, and with the help of Blablanadon, they safely reach the castle of the Beanbean Kingdom. With the adventure over, Mario, Luigi, and Peach say goodbye to Peasley, Lima, and Queen Bean. However, before the heroes of the Mushroom Kingdom leave, the prince attaches a gift to the back of the Toad Express. The gift (if it can be called that) was Bowser, trapped in gift-wrapping paper.
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