Oh boy. Swanfoot's main reason of becoming leader is due to hubris. She think she can do better than everyone else! She's a sufferer of Schizoid personality disorder which means she can't easily relate to the feelings of others + the fact that Greynose instantly distrusted her upon her joining of Tumbleclan, which left her wondering why she was deemed untrustworthy for moons + the fact she is a narcissist. And as such Swanfoot doesn't realize the things she's doing are bad, because she doesn't care! As for the reason of her becoming leader, it's because she thinks she can do better than both Greynose and Sagestar! Her goal is to make Tumbleclan even bigger & better than the other clans, as Sagestar's goal was simply for Tumbleclan to live. She doesn't want Tumbleclan to just 'live'. (If you've got a better reason please tell me!)
As for those that'll die during Swanstar's reign:
Foxtail - She'll try to fight back, as she knew Greynose didn't trust Swanstar and she finds it suspicious how Sagestar just disappeared like that. She confronts Swanstar and tries to get her to step down due to the fact she never visited the moonpool and because Foxtail believes Sage's still alive. She is lead out of camp by Swanstar, and after a long time of talking, Foxtail gets angry when Swan reveals that she did indeed kill Greynose. At this point Foxtail is quite close to a river and all Swanstar does is push Foxtail. - She drowns
*Bleakpelt - He technically dies after Swan dies, but his death is caused by her reign. When he and his half-brothers are exiled, Bleakpelt takes them to a twoleg place due to the fact they've not yet learned how to fight or hunt and tries to get them to safety with a nice twoleg. Cranekit (then Cranepaw) gets annoyed and runs away, he runs onto a thunderpath, the idiot! Bleakpelt runs out to save Cranepaw and thus gets run over. He does live long enough to tell Cranepaw and Cuckoopaw to just get to safety.
Smokefur - She is appointed deputy during Swanfoot's reign and is insanely proud of it. She however one day tries to execute Sedgetail, their prisoner, but she didn't ask for Swanfoot's permission and thus gets killed for trying to kill Sedgetail as a punishment. She is thrown off the 'bluff', the same bluff she was trying to kill Sedgetail on. Ashstripe becomes the deputy after her.
Ashstripe - Towards the end of her reign, he is really depressed. His mother died and poor little Rosefur is extremely traumatized. When Eagleclaw returns with the loners, Ashstripe eager to please the one cat that's always been by his side, tries to kill Eagleclaw. Eagleclaw being all noble and calm merely throws him to the side. One of the more eager loners wounds him badly and Ashstripe dies from an infected wound.
Palepaw - Shush...just shush. After making Dustclaw pregnant, Palepaw is vetoed as a 'predator' of some sorts and Swanstar has him thrown off the bluff. The clan believes he was killed due to the fact he did take a mate before he became a warrior but the main reason is because Palepaw overheard Swanstar making plans to kill off the elders.
Brightwhisker and Stonestorm - The two are basically like the grandparents of Sagestar, they care for him even though I don't tend to show that and so when they inquire where Sagestar is, Swanfoot leads them away and into a trap. Stonestorm sinks like a stone in the river and Brightwhisker only barely lives. She suffers from memory loss due to smacking her head on a rock.
Cats that die but not during Swan's reign:
*Bleakpelt naturally.
Russetleaf - She dies from a rogue attack, this death is off-scene so I'm not going into tremendous detail.
Other bits 'o' drama:
Sagestar - Swanfoot cleverly leads him through a twoleg place, claiming to have spotted Russetleaf there. He gets caught by a gaggle of kids and begs for Swanfoot to help. She doesn't & leaves him behind. Later however the battered and bruised Sagestar finds his way to a clan and lives there for the rest of his life, fearing what his clan would think. (I can't quite remember the clan, but I think it was Sunny's!)
---------------------------------------------------------------------------------------------------------------------------
And that's the specifics! If you wanna know more, please tell me!
And If you've got ideas, tell me please!