Gray
Katniss does not find out in Catching fire, but in the first book, when they are in the cave by the river.
Katniss does what Haymitch does
The book Catching Fire is about Katniss and her friends after her and Peeta win The Hunger Games. This is the second book in the Hunger Games Trilogy.
Yes, Peeta and Katniss participate in the Games in the book Cathing Fire.
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Yes. Catching Fire is written from the narrative perspective of the main character, Katniss.
When Peeta gives Katniss the pearl.
It showed Katniss growing up a bit
Katniss and Peeta visit the other districts in book two, Catching Fire.
Katniss Everdeen was 16. In Mockingjay she was 17.
If you are talking about the book Catching Fire, that would be President Snow, warning Katniss and threatening her.
Gale does kiss Katniss. But they don't tell you anything about it until the second book, Catching Fire. But Gale says, "He just wanted to do it one time. Just once."