odd·ball 
/ˈɑ:dˌbɑ:l/ noun
plural odd·balls /ˈɑ:dˌbɑ:l/ noun [count] informal : a person who behaves in strange or unusual ways
▪ He used to be a real oddball back in high school.
▪ He used to be a real oddball back in high school.
— oddball adjective always used before a noun
▪ The film's oddball characters are hilarious. ▪ oddball behavior
▪ The film's oddball characters are hilarious. ▪ oddball behavior
