何者

1. Origins, structure, and basic meaning

• Structure: 何者 (なにもの) is an interrogative pronoun asking what kind of person or identity someone has.
• Basic usage: 自分が何者かを説明する identifies oneself to reception, while 人物が何者なのか分からない leaves the identity of a figure from the darkness unknown.

2. Common pitfalls and similar expressions

• Self-identification and unknown figure
  • 何者かを説明する supplies an answer, whereas 何者なのか分からない marks missing information. Unlike a general 何 about an object, this focuses on personal identity.