I get the sense that Harry has never built a real identity of his own. I think that a lot of his identity, whether it was intentional or not, was built around being Diana's son. When he was in the army of course his primary job and identity was as a soldier, and then when doing royal duties, he often did them in conjunction with William and Kate. W&K have started really building their royal identities now, but I feel like Harry never really got the chance to do that since he left so soon after becoming a full-time working royal. He of course has his passion projects (Sentebale, Invictus Games, veterans issues) and they will always be important to him but I think that other than that he seemed quite lost after leaving the army and where he fit in, and I think really globbed on to the issues that Meghan is passionate about.