It's in this order. Percival is Death, Lancelot is War (he literally has a lance/spear), Plague is Tristan (same hair), Starvation is a wild card. It might be Diane&Kings child or it might be someone else.
Also, I believe this image is like the wanted posters in NNT. The designs for War, Plague and Starvation aren't their real designs. Nakaba said this is 16 years after the main series ended but we weren't given the exact time period Nakaba is referring to as the 'ending', so either Lancelot and Tristan are 16 or 26 and Nakaba does not draw young adults like that and especially not teenagers lol.