This would be a complete matter of opinion. Bluestar had a prophecy about her, and she was destined to become leader of ThunderClan. But she had kits, and queens could not be made deputy, and even worse, Thistleclaw would have been made deputy. She did not want to give up her kits, but Goosefeather had told her, "These kits are not part of the prophecy" so she had no choice but to give them to Oakheart.
Thistleclaw.
When Bluestar died saving her clan at the end of book 5.
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.
Yes, she does. Bluestar dies in the end of the fifth book of the original series because of a pack of German Shepherd dogs pull her into the river with them and then Fireheart pulls her out to safety but she knows she's already on her way to Starclan. And then she dies, leaving Fireheart to become Firestar, leader of Thunderclan. And if you want to learn what her life was like the moment she opened her eyes for the first time to the moment she dies, check out the Warriors Super Edition "Bluestar's Prophecy".
Bluestar: "I shall now name ThunderClan's new deputy. I say these words before the body of Redtail that his spirit may hear and approve of my choice. Lionheart will be the deputy of ThunderClan." From Warriors, Into The Wild
They do something that makes the leader think their ready. BUT in Warriors A Dangerous Path, Bluestar made Cloudpaw a warrior as Cloudtail for NOT BELIVEING in StarClan, so they can still make them, its just they have to do good at defending the clan. Some become Warriors for catching prey.
Tigerclaw initially respects and follows Bluestar, though he later betrays and plots against her due to his thirst for power and ambition to become leader of ThunderClan. Their relationship eventually turns hostile as Tigerclaw's true intentions are revealed.
Tigerstar's mother was a ThunderClan she-cat named Leopardfoot and his father was Pinestar, ThunderClan's leader, who eventually left for the life of a kittypet. This information was revealed in Warriors Super Edition 2: Bluestar's Prophecy. His ancestry is quite interesting, he and Spottedleaf are believed to have descended from SkyClan because in the book "Firestar's Quest" in the Prologue a she-cat with kits decides to go to ThunderClan for fear of a dangerous journey for her kits after SkyClan was driven out. So Tigerstar/Tigerclaw is half-clan (1/2 ThunderClan & 1/2 SkyClan)
three, one died and the other two were given to oakheart, her mate, and the two kits were trained as riverclan warriors
Yes, Bramblekit from "Warriors" does not turn evil. He grows up to become Bramblestar, a loyal and respected leader among the ThunderClan cats.
Tigerstar's Father is Pinestar. It says it in Bluestar's Quest and Cats of the Clans.
Lionpaw is not a ThunderClan warrior because he is a paw or apprentice