Koopa Paratroopa Trio
From the Super Mario Wiki
The Koopa Paratroopa Trio is a group of three blue-shelled Koopa Paratroopas that appear in Mario & Luigi: Bowser's Inside Story and its remake, Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey. Unlike most other Koopas seen in the games, they wear shades, bearing some resemblance to Shady Paratroopas from Paper Mario: The Thousand-Year Door. They speak with Cockney-dialect British accents.
Mario and Luigi first encounter the trio after they hit a giant Shell Block. After some quick arguing, the leader of the Koopa Paratroopa Trio silences them and tells Mario that the Blue Shell he got from the block fits him nicely. The leader teaches the Mario Bros. how to use the Shell Mario field move with a training exercise. After completing the exercise, the Mario Bros. are rewarded with all ten of Toad Town's Attack Pieces for the Yoo Who Cannon Special Attack.
Later, Mario and Luigi encounter the Koopa Paratroopa Trio again when they use a Shell Block to hit an Attack Piece Block with the Blue Shell move in the lower eastern portion of Peach's Castle Garden. The block contains seven of the ten Attack Pieces, and as soon as the Bros. obtain them, the trio flies over; the leader claims that the Attack Piece block was one of the trio's pricier possessions. The leader seemingly acts diplomatic about Mario and Luigi taking the Attack Pieces, even smacking the other two around when they outright demand the pieces back. However, one of them promptly "comes down" with a case of "punks-got-my-7-pieces-itis", and the leader decides the Bros. should cover his "medical expenses" with a payment of 30 coins. As Mario and Luigi discuss the matter, the leader believes he has the pair intimidated, only for the Bros. to reply that 30 coins is not much at all.
Stymied at the lack of fear on display, the leader talks with the other two Paratroopas, with the group wondering if they're celebrities and one of them suggests raising the fee to 300 coins; the leader balks, thinking that the price is far too high. Mario and Luigi simply pay the fee, shocking the trio when they throw over the bag of coins. Still in disbelief, the leader of the trio accepts the payment, then decides to repay the Mario Bros.' generosity by revealing where the remaining three Attack Pieces are and circling the general locations on the map. As the other two fawn over the coins they received, Mario asks for more details; the leader also reveals that the Attack Piece Blocks are invisible, and even they don't remember the exact locations. He recommends that the Bros. jump around until they find it, and leaves with the others. Finding the last three Attack Pieces rewards Mario and Luigi with the Falling Star Special Attack.
The Koopa Paratroopa Trio are seen with the other citizens of the Mushroom Kingdom, trapped in a bubble as a result of the dark power that Dark Bowser has unleashed onto the land, and are freed upon his defeat.
Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey
In addition to reprising their roles in the main story, the Koopa Paratroopa Trio reappear in the remake's Bowser Jr.'s Journey sub-mode, where they appear in two missions. In Friend or Foe?, the trio briefly fight with Bowser Jr., thinking that proving tougher than his son might give them leverage over Bowser himself. However, after Bowser Jr. defeats them, the trio inform him where Larry and Lemmy were located before leaving, pondering if they might have an opportunity to rescue Bowser Jr. in the future. They later appear in The Three Forgotten Brothers, where they try to take a picture of them ambushing Bowser Jr. and Roy (who were laying around out of boredom) as proof to Fawful, only to be reminded that Mario and Luigi had long defeated him, and then proceeded to fight them out of pride. After they are defeated, they join Bowser Jr.'s troop as allies.