Much like Mario's Power Bounce, bonks an enemy multiple times until he misses the action command. Outside of battle, it can be used to describe the people Mario meets and the places he visits. Headbutts a single enemy, like Mario's Jump. He is also infatuated with various females in the game (namely Misstar, Vanna T., Merlee, Merluvlee, and Pop Diva). He also stated he does not like eating fish, would like an Albino Dino as a pet, and that he is afraid of heights. He will occasionally break the fourth wall and his tattles seem to indicate a friendly rivalry with Kooper.

Goombario is very analytic and playful, as he hints at desires to play with young Toads, young Yoshis, and Merlow. Goombario receives three letters at the Toad Town Post Office: one from the Red & Blue Goomba Bros. At the end of the game, he is invited to the party by Princess Peach. If Mario holds Goombaria's Dolly when returning to Goomba Village, Goombario will suggest that Mario return it to Goombaria and if Mario says no, he would suggest that Mario return it when he is 'done with it' (while Goombaria would call Mario a 'meanie' if refused). According to Goompapa, he is named after Mario. In the field, Goombario can use his tattle to find out where Mario is and tell him about the people they meet. When they return, Goompa suggests that Goombario join Mario on his adventure, and he accepts. Later, when Mario falls off the balcony in Goompa's house, Goompa and Mario find a Hammer and smash through a yellow block to get back to Goomba Village. When Mario falls into Goomba Village at the start of Paper Mario, Goombario's sister, Goombaria, finds him and then lets him rest in the village's Toad House. He also wears a blue cap and has blushed pink cheeks to distinguish himself from other Goombas. Goombario's appearance is somewhat atypical to that of a standard Goomba in that he has two flat teeth instead of the standard fangs the only other Goomba to have this trait is Professor Frankly. In Paper Mario: The Thousand-Year Door, this task is carried on by Goombella (in the French version of Paper Mario, he even talks in a similar fashion to her), in Super Paper Mario by Tippi and Tiptron, in Paper Mario: Sticker Star by Kersti, in Paper Mario: Color Splash by Huey and in Paper Mario: The Origami King by Olivia. Thus, he is the only Party Member with two attacks which do not require FP. Goombario is the first of his party members in Paper Mario, and his specialty is providing Mario with information about the various locations and enemies in the game. As such, his name is a portmanteau of Goomba and Mario. Goombario is a Goomba who lives in Goomba Village and greatly admires Mario and Luigi. Super Paper Mario ( Catch Card/photograph cameo) ( 2007) I'm your biggest fan!” - Goombario, Paper Mario Goombario

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