Tigerclaw tries to kill bluestar in her den but then fireheart/star realizes that bluestar and tigerclaw are missing and he figures out that tigerclaw is in bluestars den. After bluetstar and fireheart/star oin tigerclaw down and the rest of the clan drives of the rogues and loners tigerclaw is sent to exile, and a day and a half later bluestar appoints Fireheart/star as deputy
after she dies, fireheart becomes firestar, and graystripe is made deputy.
Bluestar's deputies before Fireheart were Redtail and Lionheart. Redtail served as deputy before his death in a battle against ShadowClan, and Lionheart temporarily took over until Fireheart was appointed.
Fireheart's sister Princess, offered one of her kits to him so that it could train to become a warrior. Fireheart ended up bringing Cloudkit (Later Cloudtail) into the clan :)
If the leader dies in the warrior book series, the deputy would take over. Like, when Bluestar dies--Fireheart was the deputy--Fireheart would take over the leadership of the Clan.
Yes, he becomes a ThunderClan apprentice, Firepaw, then a warrior, Fireheart, then Bluestar's deputy, then when she died protecting her clan he became leader.
Well when Tigerclaw gets banished Fireheart becomes deputy. He is then leader after Bluestar dies and he elects Whitestorm After White storm dies, he elects Graystripe. When Graystripe goes missing, Brambleclaw is elected. Brambleclaw is the current deputy. So the clan leader decides who takes over the deputy.
Who knows? Well, obviously Bluestar trusted him more than any other cat after Tigerclaw tried to kill her. He was a good choice, after all. It was her choice; there's no real reasoning behind it. ;) Why would YOU choose him to be deputy!
He becomes leader in chapter 3 and 4 in The darkest hour.
Fireheart's apprentices were Cinderpelt, Cloudtail, and Brambleclaw.
There is the threat of Tigerclaw, lurking in the forest, Fireheart struggling to take on his new role of deputy while still coping with the loss of Graystripe, and the coming storm.
Warriors: The Darkest Hour
Firepaw becomes fireheart in into the wild and later in the darkest hour he receives his leader name firestar (after Bluestar dies).