Dr. Caitlin Snow is a bioengineering expert and a crucial part of Barry Allen's S.T.A.R. Labs support team.

During that fateful explosion at S.T.A.R. Labs she lost her fiancé, Ronnie Raymond. At least that is what she believes when she meets Barry Allen. The character is described as the ice to Ronnie's fire, foreshadowing their future metahuman abilities from the comics.

Dr. Caitlin Snow/Killer Frost Quotes

Caitlin: Ronnie's alive. I saw him Cisco. I think he was following me...
Cisco: Caitlin, Ronnie died. He was vaporized in the accelerator when it went critical.
Caitlin: Ronnie's alive and he's out there, alone and scared and I need your help to find him.

Caitlin: Since when do we have facial recognition software?
Felicity: Happy Hanakuah.

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The Flash Quotes

You didn't call, you didn't write, didn't race over...

Felicity

You're starting to do that thing Oliver does, Barry. Carry the weight of the world on your shoulders. You gotta stop that, man. It's gonna slow you down.

Diggle