Aaron Brennan is a fictional character from the Australian soap opera Neighbours, played by Matt Wilson. The actor originally auditioned for the role of Tyler Brennan and participated in a long casting process, during which he sent the producers a recording of himself performing a scene, before attending an audition. Producers ultimately selected Travis Burns to play Tyler, but created the additional role of Aaron for Wilson. Like Tyler, Aaron was introduced as the brother of established character Mark Brennan (Scott McGregor). Wilson relocated from Sydney to Melbourne for filming, and debuted four months after Tyler's arrival, on 16 June 2015. The character was initially intended to be a guest part, but due to Wilson's "endearing quality", he was promoted to the full-time cast.