The main character is female though and I'm assuming the lady knight isn't her.
I think she might be. I'm not seeing any mention of a knight, so perhaps it's Marla in a knight outfit.
There's Marla, her brother, a secret agent, a food truck guy, a robot, a fairy godmother, and an evil Roman emperor. No mention of where the Viking comes in. So, yeah, the female characters are looking exactly like Super 4: a chick with a sword and a fairy.