Muzan-Demon King of the Arrowverse

He awakes with a start as a wave slams him into a beach.

"*Gasp* How rude."

His body aches as he trys to stand, the sun beating down on him. At that very instant fear shoots through him as he waits for the burning to start but to his suprise the pain and burning never come, happiness evaporates the fear away as he stares up at the sky fearlessly. To test his strength he punches a rock, expecting it to crack or shatter but instead the only thing that happens is his hand gets shot with pain.

"AH FUCK ME!!"

Anger overtakes the pain as he realizes he doesn't have any of Muzan's powers as that God promised, his body trembles him rage and a screech of scalding, vicious anger can be heard from all points of the island as Muzan(Previously Jack) thrashes around with murder in his eyes and fear deep in his heart. During his tantrum a paper airplane hits him in the face, knocking away his anger for a moment and confusing him. Obviously he grabs and opens it, beginning to read.

[ Ahem, Hello dear mortal, nice to talk to you again so soon.

Obviously at this point you've awoken and are probably pretty angry at me for not giving you Muzan's powers, or looks, well I understand that. But don't fret boyo your powers are indeed on the island somewhere, I'll make sure they're safe till you find them and as compensation for the risk you currently face I've given you another equally, potentially more powerful boon. But umm you'll still only get that when you find your Muzan powers and absorb them so they also won't help you right now... HEY I did make you a peak human though, you're just untrained luckily there are people on the island who can help and you've got amazing talent, you're no Yorichii but you're absolutely absurdly talented from the point of view of others.

With love and Good wishes, A God.

P.S. You're tantrum has attracted unwanted attention from everyone, start running dumbass

P.P.S You will also gain the looks of Muzan when you absorb the powers, fun right? YAY!]

Muzan takes the advice, running towards the forest and the cover it provides. Covering the distance quickly, not quite superhuman but definitely above any athlete on his original earth but that's not unexpected it's normal for a superhuman world to have super-humans. Once he gets in the forest, his speed slows immensely but after only 10 minutes he starts to move like he has been living in forests and jungles his whole life, his speed slowly ramping up back to its peak. Although he was mostly fearless before, the reality of the situation seems to set in as he transverses the forest and so he just keeps running, ignoring and mentally marking down the fallen plane he runs across and Fyer's camp so he can avoid them until he finds the serum with his powers.

After almost an hour of running exhaustion finally hits him and he settles down in an unused cave, he uses the wood, leaves and rocks he found on his way there to make a fire deep in the cave, far from its entrance. He sits down and cooks a rat he killed after skinning it. Forcing down all of his normal emotions and modern sensibilities he eats the rat, driven on by rage and fear he eats the rat never tasting it as all he feels is the emotions that flood through him with every bite. After a few hours of sitting in front of the fire and listening to the sound of the forest and the rain, he falls asleep on the rocky ground of his new home.