My Scaley Breasted Lori just turned three, I have the exact same problem with her. She wont let anyone near me when shes out and is also incredibly cage defensive with my other (human) family members. It seems to be the norm with Lorikeets though, more of a one person bird. Though, we used to have two galahs as well, Cobber and Wharfy. Cobber would only be nice to the rottie, Blocka. Wharfy, however, was such a beautiful old man.
To try and change Eugenes' behaviour I've just been putting her away when she does something unsociable, like lunge and grab my grandmothers nose! :/