The He Just Like Me Fr meme is a reaction image of the character Denji from Chainsaw Man looking at a TV and screaming through tears that the person on the screen is literally him. The image, derived from a recaptioned manga panel, saw heavy use as a meme online beginning in mid-2021.
The meme is used any time a user wants to facetiously compare themselves to a figure. This is often done within a comical scenario in which the user bears no resemblance to the figure whatsoever, or the similarity is not necessarily a savory one.