>MoriDeath's apprentace, but still death nonetheless. She's neither dead or alive, and assumably the rules of time don't apply to her since she and Death sense must be omnipresent in all of time and space to do their job. "Killing" Mori would just be her LARPing. Because she's all powerful, she'll most likely play a neutral role in any story-like media. Acting as a precense that everyone knows and is scared of seeing, since that implies their death is either soon or has just happened. She'll almost never fight anyone and never interfere in the "mortal world's" dilemmas. If she truly ever runs into someone who could remove her existance and she needs help killing them, she can always call Death sensei to help her.
>KiaraEasy to kill (in human form), but exteremly hard to keep dead. A part time warrior, which implies fighting experience with her sword and shield. Sword and shield can probably emit fire as well, making it had to do any sort of close combat. On death, she is reborn with a firey explosion [/spoiler:lit]normally, she would be reborn in different dimension, but for some reason she can't leave this one, so for the time being it's safe to assume that when she dies here she'll explode into a fireball and comeback.[/spoiler:lit] If the situation gets severe, she can remove her belt turning into a giant phoenix with all the powers that brings with it. It should also be assumed that when she dies as a phoenix, an even bigger fireball is created on her rebirth. The only known way to truly kill her would be to remove all her feathers before killing her. This ensures she won't be able to be reborn. This would probably be extremely difficult to do since she wouldn't just let you, but she is the last of her kind, so this means that there is a way. Ame would not be able to kill Kiara at birth since Kiara wasn't born in this dimension originally. Mori and Ina are her only real worries and Mori would most likely not fight anyone.
>Ina***Due to Ina being extremely vague on what she can do, she ranges from being either stronger than Mori or weaker than Gura as eldritch creatures aren't black and white, but the fact that she is truly a human is undeniable. In the case of her being weaker/as weak as Gura, AO-chan can only summon tentacles to fight for her. She can't summon too many at a time and they're relatively easy to defeat. In the case of her being stronger than Mori, on top of her summoning powers, AO must have the ability to allow her to transcend time and space, and the ability to remove things such as "death" from existance and becoming death herself. Only time will tell how strong AO and Ina truly are.
>AmeDespite being human, her ability to time travel allows for her beat almost anyone by either constantly undoing their ability/her inevitable death much like, Ringo from Jojo (Yes I'm referencing that shit because it's the most accurate to describe this aspect of her power
https://www.youtube.com/watch?v=ZhKH_bma5WE). Another much simpiler solution is for her to travel back to their birth or before their birth and killing either them as a baby or the mother. This of course would lead to drastic changes in the timeline and it's doubtful she'd do something like this unless the situation is extremely dire (as it is the easiest solution with the most unforseen consequences). On top of this, it's unsure if she can travel time and space, so for her to do this, she would need to know where the individual was born/lived as a baby, go there in the future, then travel back so that she's in that area and the job is easier to do. Her and her experience with guns would only work against Gura and nonENs
>GuraA literal shark with a Poseidon's trident (and all the powers that it brings, assuming it has power and it isn't all Posidon). Despite being signifcantly stronger than Ame with her coming from Atlantis and having the trident, Ame would still be able to beat her due to her timetravel, assuming it's a fair fight and Ame isn't killed by suprise going back in time and killing her as a baby is always the viable.