Great. Not predictable at all.
Someone here is actively asking for trouble... on a grand scale.
Once an otherworlder understands the situation, they get a pretty big incentive to side with the demons.
Or at least the dwarves, who are still a relatively neutral third-party in the story.
Or even better, have said otherworlder side with the dwarves and the demons to build a coalition actually intent on bring the elves down.
All it takes is an individual with a skill seed versatile enough to grow a whole faction way stronger than they were initially.
And metaskills like the MC's tend to be OP most of the time.
Changing even one character in a status sheet can be extremely powerful, specially when you consider that the japanese language crams a lot into one "character". (It's basically the equivalent to changing a whole word in a western language.)
It is still way underused as I see it. When he starts changing words instead of just digits, this will be a whole game-changer.