Karen Berg

Lackey A shares the Jiggle Butt Gang's exaggerated confidence and enthusiasm for petty theft. He follows the Leader's schemes with little resistance and treats the group's bizarre combat methods with complete seriousness.

Like his companions, he is far more confident before a battle than after Fairy Tail's stronger mages begin retaliating.

Canon does not distinguish his individual personality extensively from the other gang members, so more detailed traits would be speculative.

Karen participates in the Jiggle Butt Gang's shared Secret Jiggle Butt Art. The trio weaponizes powerful gas emissions from their oversized posteriors, producing attacks with both concussive force and an overwhelming odor.

Gas-Butt Triple Ecstasy combines all three members' power into a single large discharge and is strong enough to wreck the interior of a train.

Gas-Butt Triple Ecstasy Fire Special ignites the discharge after the gang creates friction, transforming the attack into a burning gas blast.

The gang's individual members can also perform Point Blank Ecstasy at close range.

Karen appears with the Jiggle Butt Gang when the thieves hijack a train transporting gold.

The gang encounters Team Natsu and temporarily draws Wendy Marvell into its antics, proclaiming her their goddess. Their attempt to complete the robbery nevertheless fails because of Fairy Tail's presence.

The trio returns during the Key of the Starry Sky storyline, where they try to obtain a piece of the Infinity Clock found by Fairy Tail.

Their second major scheme again collapses once Erza Scarlet becomes sufficiently angry to intervene decisively.

The Fairy Tail incarnation remains officially unnamed beyond "Lackey A"; the Kalen/Karen Berg identity belongs explicitly to the equivalent Rave Master character.

Wonderful Gocche is the database name associated with the Jiggle Butt Gang's Leader and Karen's superior within the trio.

Wendy Marvell temporarily joins the gang and is treated as its goddess.

Natsu Dragneel becomes an opponent during the gang's freight-train robbery.

Erza Scarlet later confronts the gang during the Infinity Clock search and decisively ends their interference.

Lucy Heartfilia and Gray Fullbuster are among the Fairy Tail members repeatedly caught up in the gang's schemes.