Famine is probably Gawain because his namesake is about as famous as the other 3's. He was already kind of teased in the sketches where Mael was apparently talking to the new host of Sunshine. There's a bit of a missed opportunity with his title considering that Mael was called the Angel of Death, but I guess Nakaba has something more interesting planned for the titles than just that.
Plague's hair style is similar to Tristan and Meliodas so his identity is obvious.
War has a spear just like Lancelot when he was a kid.
Not sure what to make of Percival being Death. He is the last horseman and has the most impressive title so I suppose it's fitting for the main character.
I'm guessing the titles bear some kind of relevance to the characters just like how the Sins were given their titles based on the crimes they had been accused of. Could be something related to their future actions as predicted by the omen or maybe just a reference to their magic abilities. The thing Percival's golems did with attempting to prevent Pelgart from using his magic could be related to his title somehow. Or it could be that there's another twist involved and the knights actually do pretty much the opposite of their titles, since Percival can heal himself and in a sense "give life" to golems. I wouldn't be surprised if his magic ability was called "Life".
Very glad to know the knights apart from Percival appear to be adults. I can handle one shota, but four would have been pushing it. 16 years is maybe stretching the "a few years" description somewhat, but it does fit in with the upper limit for Katz's age that I mentioned a few weeks back when I was speculating about the timeline. This also means Arthur is now something like 44 years old. I don't know how reliable the picture is, but he doesn't look like he's aged at all.
As for the plot, I'm a little bit surprised that Pelgart didn't end up training Percival like he said he would. That kind of defeats the point of making him so friendly at first, but I suppose it can always happen later on. Percival and Donnie having to learn to survive and find things out on their own is much more interesting anyway. I'm glad that Donnie is sticking around as he feels more normal and grounded than Percival, both in terms of personality and abilities. In a way he's like the Elizabeth of the group, with the fox probably playing the mascot role like Hawk. I'm very curious who they will run into next seeing how Diane was introduced in like chapter 5 or so of NNT and Ban soon after that. Percival's gang should be expanding soon too.
So is Nakaba jebaiting us with drawing Diane&Kings child as a guy? I swear it was gonna be a girl before.
King and Diane's child is probably the Diane-lookalike girl shown in the sketches, because her dialogue is apparently about how she and the person she's talking to met each other back when they were kids. Odds are she's speaking to either Lancelot or Tristan.
I don't know why people are so fixated on the idea that King and Diane's child is going to be one of the main characters. Tristan and Lancelot had full pages dedicated just to revealing their names back to back, and then Tristan got the last chapter all to himself while Lancelot got his own one-shot. Meanwhile King and Diane's child has only been mentioned off-hand like twice and never named. That kid was never going to be as important as the other two. I think he/she is probably going to be the central character in some sort of a conflict involving the fairies and the giants later down the line. The giants are especially interesting since back in NNT they were slowly going extinct or something and we also learned that Chaos itself was disappointed in them. They'll get their redemption eventually, probably through King and Diane's kid.