Aaron Hotchner is the main role throughout all seven seasons. Hotchner plays the unit chief of the BAU team, and is one of the most experienced agents in the BAU. As far as being an realistic role as the chief, he portrays a more exciting chief than I would think, and he doesn't seem to worry too much about the repercussions of being responsible for the end result, which is always on the shoulders of the top commander.
David Rossi Is a Supervisory Special Agent and is a highly experienced profiler who once worked in the BAU. He is the persuader of the crime unit. He is a fast talker and is one who will get information out of the suspect. I believe that there would be a lot of these type personalities in the criminal justice system.
Derek Morgan is also a Supervisory Special Agent and is a confident, assertive, and often hot-tempered character. I find although he’s hot headed, he is the best at taking time with the kids and has a very soft spot for them. He to me would be a typical guy that would work in the field of criminal justice.
Emily Prentiss is another member of the Supervisory Special Agent. Emily is a big help to the Criminal Minds crew because she can fluently speak different languages including Arabic, Spanish, Russian, and working on Italian. I highly doubt that this character is a realistic portrayal of an agent that we have today.
Elle Greenaway is was assigned to the BAU because of her expert abilities in the the sexual offense crimes. So therefore she is a big help when it comes to sexual crimes. Realistically I think that her role in real life...