I technically have two self-MOCs, Jethryn as my G1 selfMOC and Jetera as my G2 selfMOC. I considered them to have the equivalent relationship that Tahu Mata had to Tahu, Master of Fire. Jetera has had more depth put into him and is a better developed character (and MOC), with his only real downside being that he belongs in the now defunct G2 canon. As such, I want to have a roughly parallel version of Jethryn, though I’m not sure whether I want to have him mirror Jetera’s design explicitly, or use a more traditional BIONICLE design.
My mindset now is somewhat closer to that when I was working on Jethryn rather than Jetera, but I also see no issue in having one or both “age with me”, either in personality or aesthetic choices.