Takayama Misa

Takayama Misa is a level 90 Bard and a high-ranking member of D.D.D, the biggest battle guild in Akihabara.

The Depths of Palm
Misa reports to Krusty about happenings in Akiba, mentioning Maryelle's meeting with Akaneya, Woodstock W, and other smaller guilds' guild masters. She then piques his interest by reporting that Shiroe, Naotsugu, and Akatsuki had gone to Susukino.

Resolve
Misa is shown alongside Krusty when Maryelle and Shiroe discuss the current situation in Akiba.

Villain in Glasses
After Krusty receives the invitation to attend the Round Table Conference, she confirms with him that their next raid was canceled due to overlapping schedules. He then tells her that he was less interested in the conference itself than in Shiroe, who was one of the organizers.

Round Table Conference
Misa and Rieze accompany Krusty to the Round Table Conference and watch as the events unfold.

Grab it in Your Hand
After the conclusion of the Round Table Conference, Misa observes one of the Eastal scouts that was watching their guild hall and asks Krusty if a war with the People of the Land was possible.

An Invitation from Eastal
Misa attends the ball held by the Eastal nobles and dresses up for the event like the other representatives of the Round Table Council, as she accompanies Krusty.

Eliminating the Goblin King arc
Along with members of D.D.D. and the Black Sword Knights, Misa goes to finish the Return of the Goblin King quest by eliminating the Goblin King. However, during that time, the flavor text on her scythe ends up becoming real, and during the events that unfold because of it, she ends up losing her right arm.

West Wind Brigade side-story
Misa is alongside Krusty with her weapon in tow when they go to fetch the two new players that the West Wind Brigade were protecting. Upon meeting them, Krusty instantly moves to attack Soujiro, but is blocked. Misa then tells Krusty to stop fooling around and before they leave, is seen next to Nazuna, possibly exchanging information.

Trivia

 * Her name is a pun, being able to be read as both "Misa" and "Sansa." The former is the real pronunciation, while the latter is her nickname, as it also can mean the military rank "Major."