Given the task definition and input, reply with output. In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.

Sentence1: On a Friday night, Bobby wanted to hang out with his friends. Sentence2: All of his friends were busy tonight though. Sentence3: So Bobby made imaginary friends. Sentence4: Bobby hung out with his imaginary friends. Sentence5: Later Bobby went to sleep and was happy with his new squad.
Friends, Imaginary friends, Bobby