Lukas worth it?

The don't have the same job at all. I personally like Lukas; but he won't double anyone, nor have a fantastic attack. But with Fortress and a Def+ IV; he will have a 43 Defense as a 4 star. Give him Ignis; and all the 3 or 4 attacks (depending on his weapon); he can destroy for you the reds. (He will be destroyed by looots of mage though)

Shortly; he is mostly a good tank. But look at his page; there is a build of him for attack too I think.