I can see this having great utility in many ways. Though never a die-hard MMORPG player, I did roll a number of rooms that, amongst them all, helped me to shape my avatar here most appropriately to my current needs.
My only note on this is that the selection of background music during the avatar creation phase and your explanation of what mana is was far too dark for the circumstances. It was music I would expect to find while doing a run in a shadow or dark region, or potentially when entering an instance for an epic boss fight. Generally one would be hearing more upbeat and "pep-talk" style music at the initiation of a new base level character - or even reconfiguring gear/specializations/stats on an existing one.
Granted, I don't have a wide range of MMORPG experience (mainly WoW - "For the Horde!" 😁) but I have seen enough others in action to feel fairly comfortable with my comments above. I thought the concept a great one when I first read about it a few years ago, particularly in the residential treatment centers for online gaming addiction in Japan and Korea. I am a mental health and disability services professional myself and my clients often present with these issues so I like to stay "in the loop" somewhat.
This practice is the first direct application of gamer-centric therapeutic and psychological technique I have had the opportunity to experience myself, and I can easily see how effective it can be for those already familiar with the format but perhaps less so with meditation as a mental concept. Different ways of expressing visualization in the end, but flexing the same mental muscles in many ways.
There's actually an audiobook on Audible right now titled "Sentenced to Troll" wherein an online troller is sentenced in court to run a troll avatar in order to experience the taunting and negative feedback personally that he had been using out to others. I haven't heard/read it yet, but it's on my wishlist, and the relatively new "Gamer Lit" genre seems to be taking off. I can see that working well with your meditative practices for sure.
Thank you for your innovative work and for sharing it with us here on Insight Timer. I will be looking forward to experiencing more of your practices in the future. I see the light in you. 🤲🏻❤️🤲🏻