oddball

plural oddballs

1. An eccentric or unusual person.

   "She's different, mister. A real oddball, if you know what I mean. But your little girl would love her. All kids love the Doll Lady."

   1989, Maris Soule, Storybook Hero, page 5

   1 more example

   Miss Quinn thought that Oswald spoke Russian well in view of his lack of formal training; she found the evening uninteresting. Donovan, with whom she had a date later, testified that she told him that Oswald was “kind of an oddball.”

   1964, Earl Warren et al., Report of the President's Commission on the Assassination of President John F. Kennedy, page 685

   Synonyms: kook

2. medicineA deviant stimulus that appears among repetitive stimuli during an experiment, to trigger an event-related potential in the participant.

1. not comparableExotic, not mainstream.

   An oddball word processor, for example, might never be supported by such helpful tools as spelling checkers, indexing programs, footnote utilities,...

   1984, Steven K. Roberts, The Complete Guide to Microsystem Management