King Nocturne
OncomingStorm12th proposes a new name "Nocturne (The Singer Not the Song)"; Amorkuz proposes a new name "King Nocturne"
Talk about it here.
The Nocturne was a conceptual being imprisonned inside another universe along with Sutehk and a number of other godlike beings who were a threat to the Doctor's universe. (COMIC: The jazz monster)
Biology
The Nocturne was a conceptual being made of living sound. Its true form was that of a monstrous worm-like creature which towered over humans. It had multiple legs, eyes and mandibles and its body was a red color with a pale outline. (COMIC: The jazz monster)
Powers and abilities
The Nocturne, like any conceptual being, was according to the Tenth Doctor, " very versatile". It could manipulate sound for various and creative purposes.
On Wupatki, the Nocturne hid itself as a virus inside songs broadcast from a radio station. The virus could infect the Shan'tee, another race of conceptual beings made of living sound. Once it took over their bodies, it deformed them and they gained a Grim Reaper-like appearance and became mindless killing machines. The virus quickly learned how to infect humans and could even adapt to different counterattacks. (COMIC: The singer, not the song)
On Earth, the Nocturne could possess people and link them together to form an incubation field that allowed to fully materialize physically in N-Space. The people it possessed could fire electrical arcs that incinerated the target. It also formed a shield of solid sound around an entire building to prevent anyone from escaping. (COMIC: The jazz monster)
Biography
At some point, the Nocturne was trapped, along with many other dangerous entities, in another dimension. These other aliens included Sutehk, an old enemy of the Doctor.
