A new addition to Bowser's minions, Plant is declared in one of Richter's dreams to be the hero to defeat the kingdom of Noctus.  As of right now, he's easily terrified and not very good at one-on-one fights, nor can he access the power hidden inside, but he's enthusiastic about learning as much as he can from Richter.

Voice-wise, he's very high-pitched, albeit not quite shrill enough to count as a child.  Given that he's the main hero of the narrative, he's going to be featured in a lot of key scenes, particularly of the emotional kind.