Lind Wanijima is Akito's third personality and claims to be the first person of Akito's body (in other words, the "true" personality). Lind is the strongest personality shown thus far. Unlike Agito and Akito, Lind seems more mature, masculine, and level-headed. He also refers to Akito and Agito as "babies," hinting that he is much older then the others much like a older brother would.
For more info on Lind, and the other personalities click here.