Yes, initially the plan was for every member of the team to get a different banner, but due to my keyboard issue I only had access to some of the sprites I made.
Here are three that I finished but never uploaded and therefore couldn't access when I made the banner:
Cyan dressed up as Golbez. You can't even tell it's Cyan though, only his eye color and the pose he's in, much like Edgar as Kain.
Relm as Porom. I was debating whether to change her hair more or not, which is why she never got uploaded. Gau was going to be Palom.
And yes, that is Mog dressed up as Zemus.