Dinah Alcott

Dinah Alcott is the niece of Brockton Bay's mayor and a powerful precognitive.

Personality
Prior to triggering, she led a relatively normal life. Without Coil's interference, she might have just stopped trying to use her power.

Her personality was obscured by her forced drugging and was instead obsessed with her 'candy', her understanding of her addiction. Her relative complacency during the event could have been affected by the fact she knew she might get to come home someday. After her release, she became focused on humanity's survival in preparation for the End of the World, and was willing to do morally questionable things to increase the number of lives saved.

Parents
Presumably healthy and was willing to return to them.

Coil
Her captor. Was completely fine with his death.

Taylor Hebert
She met her a few times but had only two possibly three conversations of note with her. She was protective towards her, both for being grateful for Taylor's assistance and her role in saving the world.

Appearance
Dinah is described as a pre-adolescent girl with straight, dark-brown hair. While in Coil's custody she was heavily drugged, and visibly malnourished.

After being freed from Coil, she cut her hair short.

During her meeting with the Wardens after the Attack on Teacher, Dinah wore a blindfold and a nice-suit dress, both with a wild pattern to it.

Abilities and Powers
Dinah has the ability to see the likelihood of something occurring in the future, which her power resolves into a percentage chance. She does this by perceiving trillions of possible universes and sorting them into groups based on a single event.

At Coil's insistence, Dinah also demonstrated the ability to pick out a single timeline and interpret it, which was used to see a future where Crawler did not kill her, Coil, and the Travelers. It allowed them to find a situation where they could escape and then employ it.

If someone asks Dinah a question, she does not have to answer that question. However, she could instinctively look at assorted futures in response to a question. For this reason, she appreciates it if other people can avoid phrasing things as questions. If Dinah lies about an answer provided by her power, it messes up her power for a while after, likely because actions relating to this answer affect the results.

Her power was not absolute, it could be affected by "stoppers" likely Thinkers who have powers that can cause the actions of others to change.

Over time, Dinah could ask more questions per day. When Coil revealed Dinah to the Undersiders, he initially wanted her to answer six questions. On the day Crawler visited Coil's base, Dinah asked around 15 questions. About 2 years later, after saving her power for the Slaughterhouse Fight in Los Angeles, Dinah could ask around 36 questions that day. After the Attack on Teacher, she mentioned how she could ask 40 to 50 questions per day.

Background
Triggered at school. She was not aware of this at the time. Complained of various kinds of headaches for weeks, before going home sick.

Story Start
While the Undersiders raided a local Bank Dinah was kidnapped from her home.

A newspaper article carried news of her kidnapping but there was no news of a ransom note or similar.

Her existence was revealed to the Undersiders, possibly as a test of loyalty.

Post-Leviathan
When looking over the data stolen from the PRT and learning that the Slaughterhouse Nine were in the area Dinah prophesied that Jack Slash would be the one that would trigger the world-ending event.

Was instrumental in saving the personnel at Coil's base when Crawler decided to pay a visit.

Post-Slaughterhouse Nine
After Coil's endgame began she was given to Skitter to return but this turned out to be a ruse. When Coil was killed, she was freed.

The Protectorate later sent along Assault to confirm that she was returned

She set herself up as a rogue, selling answers both for funds and in order to steer the future so that the End of the World would kill fewer people.

The Timeskip
During the Slaughterhouse Fight in Los Angeles, Dinah contacted Golem through the comm system and let him ask questions.

Gold Morning
She was at the Cauldron meeting with Faultline’s Crew and provided valuable information about how things came about.

Despite willingly trying to assist Khepri, she was not allowed to participate in the Gold Morning. Instead, the goddess returned the note she'd kept, the one that said: "I'm sorry".

Post-Gold Morning
Was later brought to the Undersiders meeting, where she participated in a toast to absent comrades and was lied to.

Ward
Still in the business and provided a valuable piece of advice for surviving humanity. Was targeted by Teacher, according to him, she has links to anti-parahuman factions and Gary Nieves.

She admittedly opposed Earth Cheit and Shin interventions and attempted to act against Teacher, but was countered by Christine Mathers.

Post-Attack on Teacher
Following the Teacher's defeat by The Wardens, terror-attack on mayor Wynn and call to evacuate The City, Nieves brought Dinah to Wardens. Dinah argued that Contessa is untrustworthy. She reported her previous manipulations to The Wardens, but denied examinations by Thinkers and threatened with Palanquin involvement if she was detained. She prophesied several almost imminent catastrophes with mass civilian casualties, all with Contessa overseeing them.

She joined The Wardens' thinker pool, and was present in the Wardens' situation room during the Second Shin Crisis.

The Ice Breaks
Dinah continued assisting The Wardens, and was present at the anti-Simurgh rally.

The thinker group she was part of was targeted by The Simurgh during her assault on Wardens Complex, and suffered continuous attacks from compromised individuals. Eventually, some of the thinkers succumbed to Simurgh's song and took Dinah hostage. She was freed by Victoria Dallon and helped her to disable The Mathers Giant.

Trivia

 * Identified by the author as the third most powerful precognitive in the Worm setting. The first two are likely Contessa and The Simurgh, although it is unclear which of the two is the most powerful.
 * Her verbose and formal word choice when addressing others, along with her mature behavior for her age, has led to speculation that Dinah may have some form of High Functioning Autism.syndrome.
 * It was actually Imp who came up with the name "kid Cassandra", though Tattletale probably deserves credit for popularizing it.