余計者
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Meanings
1
unwelcome person; third wheel; interloper
Refers to someone whose presence is felt to be unnecessary or a nuisance, often in social situations. Can be used self-deprecatingly.
We want to talk just the two of us, so you're a third wheel.
Nobody talked to me at the party, and I felt like an unwelcome guest.
2
superfluous man (literary archetype)
A literary term for a character type, especially in 19th-century Russian literature, who is alienated from society and feels purposeless. Not used in everyday conversation.
The 'superfluous man' in Russian literature refers to a character who cannot find a place in society.