It rose from the depths of a dozen years and more....
I switch back and forth, and it depends on context. In live-action play, it is mostly 1st person. At a tabletop, I try for mostly 1st person in in depicting the character's speech, and a mix when depicting action. Often enough there's a need to differentiate between the Character and the player, and then it is 3rd person - GM: "Are you angry?" Me: "Corven is angry, I think this is hilarious."