Otherness is one of the fundamental questions for thinking about the possibility of something else, it is probably one of the conditions of possibility of a pre-new, because it brings back the truth of the miserable or incomplete existential, desiring and passionate individuality.
A heavy moral requirement which would be an unattainable, determined and determining double.
The other which refers to an otherness buried deep within oneself, which is in some way part of oneself.
The questioner and the questioned, the problem and the problematized would, certainly, be the same person.
This question would have in it what problematizes it and which leads it to ask the question of who.