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: Will and his roommate were having an argument about pizza. Sentence2: They disagreed on which topping was better - ham or bacon. Sentence3: Will ordered a pizza, half with ham and half with bacon. Sentence4: The two guys did a taste test using the pizza. Sentence5: They both decided that bacon is the better pizza topping.
Will, Roommate