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

Ramsey: You know, I don't understand you Barry. You march towards death without fear, just like mum. Where is it you get your strength?
Barry: Probably the same place she did, people I love.

Barry: Are you OK? Look, I can get you out of here. I can help you understand what happened to you.
Bette: How?
Barry: Because it happened to me, too.