who is cable in marvel's deapool

Cable (Nathan Summers) is a fictional character appearing in American comic books published by Marvel Comics, commonly in association with X-Force and the X-Men. The character first appeared as a newborn infant in Uncanny X-Men #201 (Jan. 1986) created by writer Chris Claremont, while Cable's adult identity was created by writer Louise Simonson and artist/co-writer Rob Liefeld, and first appeared in The New Mutants #87 (March 1990).

Nathan Summers is the biological son of the X-Men member Cyclops (Scott Summers) and Madelyne Pryor (Jean Grey's clone), the half brother of Rachel Summers and Nate Grey, and the genetic template for Stryfe. He is from a possible future timeline, having been transported as an infant to the future, where he grew into a warrior, before returning to the present.