Chapter 28 - Fecto Elfilis fanfic ideas

I actually saw a fanfic about this not too long ago where someone became Fecto Elfilis and I thought what if we take it a bit further or maybe something similar in other worlds like what if someone became Fecto Elfilis in One piece, Danmachi, Naruto, the Marvel or DC worlds, or even the RWBY world. I thought maybe go crazy with it and the person also has the ability to become Chaos Elfilis or even Genwel Meteonelfilis, so yeah if he or she can't defeat the enemy as baseline Fecto they can go Chaos Elfilis or Genwel Meteonelfilis or if they are just really really mad at whoever they want to beat the stuffing out of, and maybe have the ability to become just the little guy Elfilin I can just see a scene where the mc helps RWBY and them out somehow and afterwards after transforming into Elfilin just gets glomped by Ruby while she screams your so cute. So some ideas for this is the MC begins with just Elfilin and Fecto Elfilis maybe not even all the powers of Fecto Elfilis at the beginning and he/she gradually learns the powers or unlocks them in someway as well as the other forms I mentioned earlier, or the person has everything and just needs to train his/her abilities, or the person has everything and just instinctively knows how to use all abilities no training needed.