When Bluestar died saving her clan at the end of book 5.
Likely, unless he dies, but not yet. So far, Firestar is still leader.
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, Firestar is generally considered a strong and capable leader for ThunderClan. He is known for his courage, loyalty to his clan, and willingness to make tough decisions to protect his clanmates. His leadership qualities help guide ThunderClan through many challenges and conflicts.
Bramblestar
He becomes Thunderclan leader.
Bramblestar is the current leader of ThunderClan. He was made Bramblestar in "The Last Hope", after the death of Firestar, the previous leader.
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Not during the current series--right now, in the books, Firestar is leader, and Brambleclaw is deputy, meaning Brambleclaw will be Firestar's successor. But, when Brambleclaw becomes leader there is a chance Brackenfur (Brackenpaw) could become leader.
He might I don't think so. Firestar is going to die in Omen of the Stars so that means that Brambleclaw is in charge. But he does have all the traits of a good leader and he's gonna get an apprentice in the Fourth Apprentice so he could become deputy when Brambleclaw becomes leader.
It is rumored that Graystripe will become leader after Firestar dies in Omen of the Stars #3 or #4. I know that Brambleclaw will not become leader but, maybe he'll stay deputy. ----------------------------- He does not, because he is not deputy. He was formerly deputy until he was captured by Twolegs and was away from the forest for so long that he was deemed unfit to be deputy because he was not aware of current events.
It is all a matter of opinion. He is still a very good leader to the clan.
No, he'll die in the same battle as Firestar. I don't think it's been proven whether or not he'll die in the Dark Forest battle or not.