Long, Cold Dark

Well, Barracuda would do that.

Long, Cold Dark is about the Punisher finding out that he has another child "“ yay! However, he finds out after the said child is kidnapped by Barracuda and used as a sort of leverage (he even shoots the baby at point blank range, even if this were just a ruse, to make the Punisher go all out against him). This won't work in the Netflix universe; where did that kid come from? Wasn't Frank supposed to be a loving family man?

Leaving this aside, Long Cold Dark would pit Frank Castle against another former soldier, thus connecting a first season of the solo series to what was already presented during the second Daredevil season. So things should be kept just like in the comic, with this little detail changed.

And Barracuda, although a less known villain, would be a suitable antagonist, because he has the same training as Frank (and I guess I wasn't the only one to see what kind of training this was, in the epic prison fight scene), he is more physically imposing, and he would do even the unimaginable in order to defeat the Punisher.

And since I mentioned Barracuda, how about revealing the possible aftermath of their first encounter?