The female: At first I didn't like her cause I wanted Hilda to be the girl for the sequel, but now the new girl grew on me. I didn't like Hilda at first cause I was on the Lyra band wagon, but I grew to like Hilda. Lyra is still my favorite Protagonist (male or female), but Hilda and new girl (who I call Serena cause of Sailor Moon) are also awesome.
The male: He looks cool, like someone said earlier, he looks like Hilbert's son, but I already assume the new protagonists are younger relatives to Hilda/Hilbert like younger siblings or younger cousins. He seems like his sprite would be nice.
The rival: His hair is definitely neat, kinda have a cool-fro going on. Plus his smirk look makes him look tough and cool. I approve of him.
The chick with the bass: She is rocking a bass so that's a plus. Plus she has the punk rock look going on. I am not sure if she is also a rival or whatever, but I like her style.