I can post the rough first draft idea I had was. & a pretty stupid one
the pulpish char idea is someone who can have his strength increased by taking a chemical he invented himself then exposing himself to some electricity, a side effect is it temporarily increases his muscle and bone mass, making his muscles swell a bit also. also helps to protect his secret identity, since he looks far to thin to be the muscled costumed figure. Maybe some high grade plastic striking surfaces like the knuckles area. Eventually makes a belt, like a weightlifter's belt with some electrodes in it to increase his strength if he's away from his lab and a need for his costumed identity comes about. to undo the effects he gives himself a surge of positrons to undo the effects and return his looks to normal.
he could be moved to the 2030's maybe. with investigating some robberies & reports of monsters. attacks one, it tries to flee through a digiportal and one of those golden ball things comes out, thinking it's an attack he punches it but since his hand isn't open it can't put a digivice into it but makes it instead into a type of bracelet he can't take off.
Eventually he grabs hold of one and is taken into the digital world, fights it there and encounters some digimon, who wonder what sort of digimon he is. 1 may help him battle the monster. Maybe is a but surprised to see a digimon wearing a digivice (assuming a digmon knows a digivice if they see one) and after the battle and talking to this strange person becomes convinced, at least at first, he's some sort of rare digimon, who's earlier stages are called johnmon, human,and his current stage is called thefistmon, but he prefers to be called fist instead of his whole name.
A stupid idea but that is the first draft idea, and pretty stupid. Maybe using a portal or combining his own devices he winds up outside the digital world and elsewhere. with his new partner.