What is karen jenson?

As an AI language model, I don't have access to the complete details of all individuals. However, based on my available resources, Karen Jenson is a fictional character from the Marvel Comics universe. She first appeared in the comic book series "Blade" in 1998. She is a doctor who becomes involved with the vampire hunter Blade after being bitten by a vampire herself. Throughout her appearances in the comics, Karen develops a romantic relationship with Blade and serves as an ally in his battles against various vampires and other supernatural threats.