A man of odd habits

Answer: Option A

One word substitute is Eccentric.

Eccentric: (of a person or their behaviour) unconventional and slightly strange.
Cynical: believing that people are motivated purely by self-interest; distrustful of human sincerity or integrity.
Introvert: a shy, reticent person.
Moody: (of a person) given to unpredictable changes of mood, especially sudden bouts of gloominess or sullenness.