You have died.
Unfortunate as your passing may have been, it was not the end of your tale. No, your soul had been taken from its natural cycle. Rather than expire, reincarnate, or find peace in the afterlife, your consciousness returned in that abyss. Nothingness. At first, it was frightening. You were unable to find footing within that darkness. Not that you had feet, anyways. You could at least understand that you no longer had a body. Panic turned to contemplation as you slowly accepted your current state. Soon, the deprivation of everything but your thoughts left you numb, unable to think.
Just as slowly as you accepted your new fate, it appeared. Even though you could see it, it took a considerable amount of time to even perceive what it was. Atop its indiscernible head was the skull of a deer. Its form was neither fully male nor female. Split down the middle, it remained betwixt. Numerous arms extended from its shoulders, each appearing and vanishing as needed. One arm reached across its torso, covering its sole breast. Another held the shaft of a spear against its neck, the tip already pierced through. Another held a stone lantern, illuminating it in a bath of crimson light. Another set of arms held the skull atop its head still. It sat across from you, still in the abyss.
Then it spoke to you in tongues. This was not a language you had ever heard, yet you could still understand it.
"The fracturing has begun," it stated, "become reborn and fix this cycle." Abruptly, it reached forwards and enveloped you inside a hand. Just as quickly as you were crushed, the hand opened. Bright blues and white hues had appeared. A sky?
Your new body began to plummet towards a blooming meadow.
So this is a pretty standard isekai RP about protecting a world that isn't yours from collapsing. So before, I'd like to start by saying THIS WON'T BE YOUR MOMMA'S ISEKAI. The world is harsh and even though you were given cheat-like abilities, the natural denizens of this world are brutal, cunning, and not as friendly as creatures on earth. This won't be a roleplay that's a power fantasy. As strong as your characters may be, there's always a bigger fish in the sea. Death is a constant threat to your characters, but smart thinking would be able to stave off death.
For inspirations, think of series like Tensei Shitara Suraimu Datta Ken, Grimgar of Fantasy and Ash, and pretty much any isekai story that you could think of. Bits and pieces are taken from many different sources.
As for character design, I would say to go nuts. There's no specifics I have in mind for what your character could be. I'd just say to stay away from world-busting stuff. I don't want to have to throw extinction level threats at your characters that quickly, after all. Your characters would have gotten new bodies in order to fit in with the world, allowing you to be any race of sentient anime fantasy race your heart desires. In order to fit in with the world, your character would have some intrinsic knowledge of what their new form is supposed to be.
I'd be looking for a small group of roleplayers, no more than 5 people for this. Probably a loose weekly post schedule, because that's more or less healthy.