Jason Gideon

First: Anyone recognize these faces?

Gideon’s character arc is painful.

Hotch’s first introduction is a testament to who he is.

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Derek Morgan

First: 1940s, he put bombs in train stations and movie theatres.

Last: You’re welcome.

Derek Morgan is introduced in possibly the most Derek Morgan way.

Split image showing Spencer and Luke in Criminal Minds.

There’s charisma and class to his character, straight away.

Viewers see his character go through unimaginable pain and loss and reckoning.

Jennifer “JJ” Jareau

First: Good.

Mandy Patinkin in Criminal Minds

Because these go to you.

Last: And here I thought I was out of tears.

Jennifer, or “JJ” to her friends, starts off as the unit liaison for the BAU.

Thomas Gibson in Criminal Minds

She climbs her way up the ranks from unit liaison to profiler and key member of the group.

In her first scene, she impresses the team with her knowledge of each member and their esteemed career.

Her emotions have often allowed her to empathize with victims in a way like no other agent.

Shemar Moore as Derek Morgan in Criminal minds

Emily Prentiss

First: Hi, Agent Hotchner?

Last: This will be her maiden voyage.

Emily is a later addition to the team, but she’s an invaluable one.

Jennifer Jareau prepares to interview a suspect in Season 10

She’s introduced in Season Two as a new team member after Elle Greenaway resigns from the FBI.

David Rossi

First: Go on, boy!

Last: I love the smell of a new jet in the morning.

Emily Prentiss crouching and looking up in Criminal Minds.

Senior Agent David Rossi is introduced shortly after the departure of Jason Gideon.

Eventually, it becomes apparent that he cares for the team deeply, despite his reservations.

Luke Alvez

First: I’m from the Bronx, lady.

David Rossi sitting in his car in Criminal Minds.

Last: Moving out of here like the Colts did Baltimore?

Luke Alvez had big shoes to fill, coming in as a replacement for Derek Morgan after his departure.

His first scene sees him undercover as a fugitive agent, capturing convicts on the run.

Luke Alvez in Criminal Minds

Much of Luke’s character is based on his time in the Army and in the Fugitive Task Force.

While he served as a replacement for Derek, Luke carves out his own path as a unique character.

He’s definitely the muscle for the team, but he’s also so much more than that.

Matt Simmons being debriefed after a shooting incident

Matt Simmons

First: Three families, three countries, in three years.

Last: We got a new one?

Matt is introduced as a member of the International Response Team in season ten.

Dr. Tara from Criminal Minds sitting at her desk in the dark.

He’s stoic and one of the pillars that keep the team together.

Tara Lewis

First: Absolutely.

Last: So, you expecting the Queen?

Spencer Reid looking down in Criminal Minds.

As one of the late starters, Dr. Tara Lewis has some catching up to do.

Spencer Reid

First: They’re calling him the Seattle Strangler.

Last: I’m gonna name her Mildred.

Criminal Minds

Similar to Gideon, viewers first meet Spencer Reid at Quantico.

He’s introduced as the shy, soft-spoken, young genius of the team.

He’s one of only two characters who were in the first and last episodes of the show.

His last line is simple and perfectly encapsulates the eccentric nature of his character.