Aang

In the sequel series' first season, Avatar Aang's spirit occasionally serves as the spiritual advisor to seventeen-year-old Korra (much like the previous Avatar incarnation, Roku, did for Aang). Initially, Aang is only able to give Korra glimpses of his memory concerning Yakone in relation to her confrontations with his two sons, Amon and Tarrlok, the products of Yakone's Bloodbending vendetta on the Avatar. It is only after she loses her ability to bend that Korra allows herself to listen to her past lives, at which point Aang restores her powers by triggering the Avatar State and teaching her to Energybend.

Question: is avatar aang in the legend of korra
Answer: yes