Captain Goomba

Captain Goomba is an officer in the Koopa Troop who achieved the rank of Captain of Bowser's minions after rescuing Bowser and multiple other members of the army from, as Ludwig von Koopa states, a "dire situation in the Beanbean Kingdom" alongside Captain Shy Guy, Captain Boo and Captain Koopa Troopa. However, despite his efforts, after discovering Captain Goomba was responsible for his amnesia in the Beanbean Kingdom, Bowser took away his rank and flag, though he eventually regained his status by the time other threats arrived the Koopa Kingdom.

Mario & Luigi: Superstar Saga + Bowser's Minions
In Mario & Luigi: Superstar Saga + Bowser's Minions, Captain Goomba was first introduced inside a barrel in the Koopa Cruiser moments before it was attacked by Fawful and Cackletta. After the attack, the stored Goomba landed on Hoohoo Mountain where he witnessed Bowser flying through the skies after he was shot by a cannon in Stardust Fields. Determined to rescue his king, he rushed through the mountain and, after beating a Beanie, met a few Goombas who, seeking to avoid the responsibility of leadership, nominated him captain of the squad.

In Hoohoo Mountain, Captain Goomba met the Hammerhead Bros. who were rejoicing with two Hammer Bros. over the four's love for hammers, but the captain managed to make the Hammer Bros. join his group after having won a battle. Eventually, after recruiting a few more troops along the way, two Paragoombas inform the captain about Fawful, who had already found Bowser's unconscious body and made them briefly lose their loyalty to the king with an unknown spray. Later, the squad encountered Ludwig von Koopa and Lemmy Koopa, both who were already searching for Bowser. Captain Goomba tried to warn them about Fawful, but they refused to hear him due to his low status in the Koopa Troop. He then encountered Fawful, who sprayed both him and Private Goomp, causing the latter to have changed sides. However, due to his Minion spirit, Captain Goomba remained loyal to Bowser. The captain then managed to beat Private Goomp, but both were blasted by Fawful's Vacuum Helmet, causing him to have fallen next to a Hoohooligan who told him the Beanbean Castle is at the base of the mountain. After having heard that, the Goomba jumped off the bridge they were both in and fell close to Beanbean Castle Town.