Cait

Cait is a possible companion in Fallout 4. She is a chem-addicted Irish pitfighter and can be found in the Combat Zone. She is able to pick locks up to and including a Master rating, though it can take her a few tries.

Background
Cait's parents were abusive and distant, eventually selling her into slavery once she turned 18. She spent five years pickpocketing in order to buy her freedom, choosing to track down and murder her parents in lieu of rebuilding her life afterwards. She began using Psycho after the murder and found herself in the Combat Zone, fighting there for three years until she joins the Sole Survivor.

Due to her upbringing and time spent in the Combat Zone, Cait is slow to trust and finds it hard to believe anybody would be nice to her without expecting anything in return. Over time she comes to trust the Sole Survivor, telling them about her addiction to Psycho and her desire to be cured of it. Her addiction is too strong to be handled by a Wasteland doctor, she mentions rumors of a cure in Vault 95 and requests the Sole Survivor take her there.

Effects of player's actions
Maxed approval with Cait grants the Sole Survivor the Trigger Rush perk, which increases Action Point regeneration when the player character's health is below 25%.

Approval

 * Cait approves of the player character successfully picking locks.
 * Cait approves of alcohol and chem usage until the completion of her personal quest (using chems afterwards results in disapproval, while drinking alcohol stops affecting her relationship with the Sole Survivor).
 * Cait approves using addictol after doing her personal quest.
 * Cait approves of sarcasm and being mean.
 * Cait approves of threats.
 * Cait approves of the player character being naked.
 * Cait approves of selfish action such as asking for, or trying to increase, rewards.
 * Cait approves criminal behavior such as pickpocketing.
 * Cait approves of helping the Brotherhood of Steel
 * Cait approves of stopping the Institute

Disapproval

 * Cait disapproves of the use of chems after her personal quest.
 * Cait disapproves of speech options that avoids you fighting said person.
 * Cait disapproves of the player character flirting with other characters if she's traveling with the Sole Survivor and they are in a romance with her.
 * Cait disapproves of helping the Minutemen
 * Cait disapproves of helping the Railroad.
 * Cait disapproves of helping the homeless, such as Sheffield.
 * Cait hates if you call Hancock a junkie in Goodneighbor. (Before finishing her quest)
 * Cait disapproves of cannibalism
 * Cait disapproves if you agree to the quest "The Slog: Greenskins"

Appearances
Cait appears only in Fallout 4.