[[folder:Main Characters]]
!Julia Houston (Debra Messing)

* DeadpanSnarker: Julia, following [[spoiler: the rehearsal in which everyone finds out that Rebecca Duval can't sing.]]
--> '''Eileen:''' What we need is a constructive solution!
--> ''beat''
--> '''Julia:''' Group suicide?
* FieryRedhead
* LoveHurts
* LoveTriangle: With Frank and Michael Swift.
* PlatonicLifePartners: with Tom.
* TearsOfFear: When her son, Leo, runs away from home.
* YourCheatingHeart: Twice, with actor Michael Swift.

!Derek Wills (Jack Davenport)
[[caption-width-right:300:"No matter what happens next don't ever doubt you are a star."]]
* TheAlcoholic: Often turns to drinking when having problems. All he does for several days just before the Tony awards is sleep and drink.
* BadassLongcoat: Derek has quite a few. They resemble like those of another [[Series/DoctorWho famous brit.]]
* HandsomeLech
* {{Jerkass}}: Derek.
** JerkWithAHeartOfGold: YMMV, but Derek's "jerk" behavior is just managing show business. When he's speaking to Ivy as a human being (as opposed to a director), he's fairly tenderhearted and supportive.
*** JerkWithAHeartOfGold fits him best, or MrViceGuy or both. He's not a bad or uncaring person. He drives people hard (and/or manipulates them) to create the best art he can.
** JerkassDissonance
* MeanBrit

!Karen Cartwright (Katherine [=McPhee=])

* TheIngenue
* TheMuse: Karen claims to be this for Derek in the Season 2 series premiere. He's less than enthusiastic both times she mentions it.
* NaiveNewcomer

!Tom Levitt (Christian Borle)

* BerserkButton: Don't call Tom's music "boring".
* NiceJewishBoy
* NiceGuy
* PlatonicLifePartners: With Julia.
* SerialDater: And how.
-->'''Sam''': How old are you?
-->'''Tom''': 37-ish.
-->'''Sam''': And how long’s been your longest relationship?
-->'''Tom''': 5?
-->'''Sam''': Years?
-->'''Tom''': ...months?

!Ivy Lynn (Megan Hilty)

* AlphaBitch: Ivy behaves like this towards Karen by being rude to her or passive aggressively trying to get her thrown out of the workshop. She gets a little better.
* BlondesAreEvil: The show quite obviously pushes Karen as 'good' and Ivy as 'bad.'
** She's an AntiVillain or VillainyFreeVillain, only by being protagonist Karen's competitor for the role of Marilyn. But it's WhiteAndGrayMorality, in that Ivy is shown as less deserving (as a person) than Karen, but not truly 'bad'.

!Eileen Rand (Creator/AnjelicaHuston)

!Sam Strickland (Leslie Odom Jr.)

* StraightGay: He doesn't want to have to wear a label, but his massive love for sports and lack of any stereotypical gay mannerisms make Michael Swift comment that, if he wants to get a date with anybody, he might literally have to.
* TwoferTokenMinority: Subverted, as he's both gay and black but he's also a big sports fan and a regular churchgoer, two traits not often found among actors/dancers. The actor who plays him downplays his sexuality in interviews, saying it shouldn't matter.

!Jimmy Collins (Jeremy Jordan)
* {{Jerkass}}
* TheStoner

!Kyle Bishop (Andy Mientus)
* MoralityPet: To Jimmy.
* AscendedFanboy
* YourCheatingHeart: [[spoiler: With his celebrity crush, Tom Levitt.]]

!Ana Vargas (Krysta Rodriguez)

!Ellis Boyd

* JerkAss: Ellis, what with his constant squabbling with Julia and [[spoiler: poisoning Rebecca Duval in an attempt to put Ivy in the role of Marilyn]].
* ProfessionalButtKisser: Towards Tom, Derek, and Eileen.
* TheScrappy: Ellis, for Julia in-universe.
** And for many fans as well.

!Dev Sundaram

!Frank Houston (Brian D'arcy James)

!Michael Swift (Will Chase)