KaosHunter
Poeden
Ironically? Patroklos is one of my better characters against Nightmare/Siegfried, especially if you get in close and stay up against him.
That said... just stay up against them, spam close-range fast moves a little if you have to, and do a LOT of ducking and quick-stepping. Oh, and with Nightmare? ALWAYS be careful when attacking him while his meter is at 1 or higher. That Critical Edge is incredibly cheap, and it -will- hurt.
Well.... I do still like the style but since it wasn't working I figured I'd give something else a try too. Enter Aeon, Ezio, and Devil Jin. So far Devil Jin seems like the most fun to play. But if Patroklos is good against them I'll probably come back to him at some point.
I'm honestly not crazy about the Devil Jin style, at least for me personally. It just feels very restrictive and awkward for me... but I rarely like -really- short reach styles.
Never cared for playing as Ezio, for similar reasons and it's just not really my thing. Plus, unless it's a character I outright adore, I tend to prefer using customs than pre-mades, and since you can't use his style in creation...
I'll admit Aeon is fun, though. It's actually the first time I've -ever- liked using Lizardman in any Soulcalibur game.