MHA: multiversal hitman

so this is a random ass idea i had while watching a video. Simple terms the mission system or hitman system what if a fanfic protag was tasked to do missions in each universe they go to for example. to kill important characters (such as main villains or the mc them self's) after a mission is completed they get rewards and power and then after the main mission is done they get to choose a universe to go to with said powers to do more missions. this will most likely be shit but meh. (prob gonna be rushed)