Cherry

Cherry is a prostitute living at Dukov's Place in the Capital Wasteland. If the player talks to her about Dukov, the player can convince her to follow him/her to Rivet City. If the player does this successfully (Fast travel is advised), he/she will be given good Karma. She stops on the bridge to Rivet City and thanks you.

Beware: If the player offers to take her to Rivet City, but later in the conversation balks, he/she will forever lose the opportunity.

Cherry can also retrieve Dukov's key for you if you are doing the You Gotta Shoot 'Em in the Head quest.

There is reported that there are ways you can keep Cherry with you forever. First pass the speech challenge to get her to team with you then leave Dukov's house. Later tell her to hold outside and go back to kill Dukov (not sure if you need to handle the Fantasia or not). After that you tell Cherry Dukov is dead and she will not leave your team anymore.