Definitely. Both the Riddler and Hush are familiar figures in comics. They have distinct characteristics and play significant roles in various comic story arcs.
It's not a straightforward yes or no. The Riddler's behavior regarding killing in the comics is inconsistent. Sometimes he's driven to extreme measures and takes lives, while in other instances, he refrains from outright murder and sticks to his intellectual challenges.
Penguin and Riddler are typically not friends. They often operate independently and may even compete or have conflicts with each other in the comic universe.