Inventor, leader and played Quidditch professionally for at least 13 years
Other canon notes and references
He was an admirer of the Heidelberg Harriers team of Germany, who he said were "fiercer than a dragon and twice as clever" (QA8).
Darren is a Gaelic Irish boy's name meaning "a great man/a gift of God" (Quick Baby Names), although its origin is unclear as it may also be an adaptation of the name Darrell (Behind the Name).
O'Hare is an Irish clan surname, derived from the Gaelic O'hEir meaning "the male descendant of the angry one" (Internet Surname Database).
He is likely to have invented the Hawkshead Attacking Formation from his experience playing as a Keeper - knowing what he would least like to see heading towards him on the Quidditch pitch.
Lexicon lists of: