Lukas is really good for Enemy Phase, while Effie is really good for... both Phases lol. Brave Lance build is insane, but she's also great for Distant Counter. She is physically less tanky, but she also has better Res. She even fits on an Armor team. Downside is 1 Mov, and her full builds are a lot more expensive, though she is pretty functional out of the box.
Wow! So you pulled better Oboro and don't need her anymore!