Ank57/in-universe

Ank57
Ank57 is a charcater in Ank57's surreal memes (he appears in them)

He responds to Ank as well

History
We at least do know that he either originated from Gallifrey or The N̊̇̓N̸̏͟N̶̷͠N̯Nͦ̑̀N͗͒̀Nͮ͑̓NNͭ̀͢Nͩ̉̇N͂̽̏N̡̧͞N͟͝͝Nͬ̏ͬN̄̀̎N̹͎̣NNB̖̮̗Bͣ̋̾Bͧ̌ͪB̡͞B̭ͭ̄B̀ͧͦB̕͢B̨B͋͝͡B͎ͬ̋B̓ͥ̂B̉́̂҉͙͉̥B̙̰B̡B̵͢͠B̂ͯ͋-th dimension (this is because Ank57 listed that he was from it, though this might be an elaborate ruse)

He has had many other appearances.

Ank57 (under the guise of a being) tried looking for 0tter, though he failed

Ank later helped seal BUP in the Hchronic.

Much of the history after this is very vague, and we still have to find out most of it because of time-travel (i.e. he has a TARDIS)