Favourite AUs/AU ideas you have

here's some randon ones off the top of my head:

bloodclan AU where skyclan doesnt exist and firestar's SE is about the return of bloodclan and how he handles it as leader. or alternatively, the second arc is about the return of bloodclan instead of moving to the lake, etc.

squirrelpaw is the thunderclan chosen cat for the TNP journey instead of brambleclaw. her love interest is shrewpaw, and leafpaw joins her on the journey and gets with crowpaw with better development between them.

leafpool decides to move clans to be with crowfeather after she trains one of daisy's kits. berrykit is chosen, and after he is trained well enough, she leaves to give birth in windclan. leafpool is trained to become a windclan warrior by crowfeather, and their three kits r raised as windclan cats. once they're older, leafpool tells them about their thunderclan heritage and they promise to stay loyal to windclan to ease her mind. berrynose becomes thunderclan's next medicine cat while being assisted by sandstorm and brightheart whenever they're needed. maybe berrynose has drama with honeyfern since he's a medicine cat now? i didnt get too far.

leafpool and crowfeather decide to truly run away. they have their kits in a meadow far from the lake and run a camp where leafpool heals passerbys who need their help. lion gets with a kittypet named angel, holly gets with a loner (i forgot his name), and jay becomes his mother's top healer apprentice out of his siblings. over time, a few loners join the healing group camp to act as hunters and guards (to guard their herb gardens and camp, etc.)

leader foxleap AU. after squirrelflight dies in the great storm, bramblestar chooses foxleap as his deputy. eventually, foxleap becomes leader and he makes his first deputy bumblestripe. after bumblestripe dies, he chooses hollyleaf as his next deputy. there's other stuff that go with this AU, such as my fan clan acting as the arc's villains (where one survivor turns into the big bad of the arc that foxstar has to take down later).

I remembered a different thread from a while back with this exact premise so forgive me for being lazy and just copying most of my stuff from over there to here...

This is kind of cliche but time travel (fix it or ruin it further) AUs are my favorite. There are quite a few out there. Otherwise I also like those where Firestar joins a different Clan or does not end up being important in the story at all with someone else taking his place to figure out what to do in stopping Tigerclaw/star.

When it comes to AUs I have created for myself or based on the general idea of others, there are a bunch as I'm currently still in the process of collecting those I wrote down somewhere into multiple notebooks. One is already filled to the brim with different ideas. Here are a few of my personal favorites:

Fireheart's littermates find and join ThunderClan later in TNP or sooner with him (there are two versions)

More FireSand litters than just one (two sons get born later in PoT or OotS)

Spottedleaf survives Clawface and steps back as a medicine cat to later become the mate of Fireheart (different kits)

Fireheart is the one in a forbidden romance with Silverstream (there are once again different kits than in canon)

Gorsepaw lives after Tigerstar attacked him and later becomes leader of WindClan instead of Onewhisker

Snowkit escapes the hawk trying to grab him and later becomes a warrior named Snowmoon

Brambleflower (Brambleclaw as a healer)

Breezepelt's littermates survive

The Brothers

Element Clans

Another one that I think I'll start writing (may share it here I don't know) is TNP with different cats (Leafpool, Sorreltail, Hawkfrost, Mothwing, Nightcloud, and Russetfur)

Oh, absolutely! And I love all of them for sharing their different (or even similar) ideas and preferences. I'm hoping some of mine (and those of other forum members) have given you thoughts for future AUs.

I continue to do so as well! GraySilver is still iconic, of course. But most of their initial romance and how it was handled annoyed me to no end during Fire and Ice. They finally grew on me in Forest of Secrets though where both of them just seemed a lot less rude to others in general than was previously the case. FireSilver will always have a special place in my heart regardless of this since there was at least some amount of chemistry between them in canon and a bit of wasted potential in terms of the drama this fanon relationship could have caused. Although granted, most of it is rather similar to how GraySilver turned out. With the exception of Firestar never taking a new mate in my own AU since the concept of a tragic "love of my life" situation just fits these two best, instead of him ever wanting to move on with someone else. 

Sorry for rambling on like this. I just have a lot of nostalgia for this ship.

for the one i started writing a while back, after silverstream dies and fireheart keeps his kits in thunderclan, he eventually moves on with sandstorm and sandstorm bcomes the best step mom ever.

my version of the fire x silver kits:

streamkit: black tom with blue eyes
sparkkit: tortoiseshell and tabby she-cat with green eyes

the twigbranch medicine cat au is super interesting! care to talk about it more?

I've had the rough concept of an AU for a while now, but I haven't gotten around to writing it yet. There was this trend on Tumblr a while back where you would use a random number generator to cull the number of Clan cats down to 10% and build an AU around what happens to the survivors. I used the first arc, and was left with a pool of Russetfur, Cedarpaw, Boulder, Oakfur, Deadfoot, Mudclaw, Barkface, Runningbrook, Dustpelt, Frostfur, Darkstripe, Mistyfoot, Featherpaw, Stormpaw, and Mosspelt. 

Okay, so the basic synopsis of the AU is that the battle with BloodClan absolutely devastates the Clans, far more so than in canon. Scourge doesn't keep true to his word about giving the Clans three days to prepare, and they fight dirty, going after elders and kidnapping kits as bait to lure cats into the city. In the end, only the above cats are left. To keep things easy to read I'll put what happens to each of the four Clans into their own subheading:

ThunderClan: 
Dustpelt returns to the ThunderClan camp to find everyone either dead or missing apart from Frostfur. Darkstripe staggers in soon after, in a state of shock from the battle. Enraged, Dustpelt attacks him while Frostfur half-heartedly begs him to stop; Darkstripe is too dazed to fight back and is killed. With no other alternative, Dustpelt and Frostfur temporarily join WindClan as refugees. 

WindClan:
WindClan is by far the best off of the four Clans, with a deputy, two warriors, and a medicine cat. Deadfoot makes plans to receive his nine lives, and Mudfur is unsurprisingly chosen as deputy. Deadfoot allows Dustpelt and Frostfur to remain in WindClan without a second thought, although Mudfur is wary. Things are as normal as they can be considering the circumstances, until a kittypet with a tiny black-and-white kitten in her mouth shows up one day and asks to speak with Onewhisker...

RiverClan:
Although she had not been officially appointed as deputy, Mistyfoot establishes herself as RiverClan's new leader and excels at the role. She juggles her efforts to rebuild with training both Featherpaw and Stormpaw; Mosspelt is pregnant and appears to be close to kitting despite not actually being far along. Featherpaw and Stormpaw are grateful to have each other, but grieve heavily for their father and Clanmates. Featherpaw struggles with feelings of rage and depression, and Stormpaw has severe survivor's guilt. Stormpaw still wants to be a warrior, but out of a sense of duty he asks to train under Barkface as a medicine cat. 

ShadowClan: 
With no clear line of succession, Russetfur is elected as the de-facto leader of ShadowClan. She struggles to rebuild, and out of desperation she begins to pressure her apprentice, Cedarpaw, to train as a medicine cat in order to ensure the Clan's survival. Cedarpaw is strongly opposed to this, and to everyone's surprise Boulder volunteers for the role instead - he says he's too old to battle or hunt, and wants to heal in his final years. Russetfur also runs into Sasha like in canon, and since there's no reason for her not to, she accepts her and her three kits into ShadowClan. The two quickly fall for each other and become mates. 

This is just the immediate aftermath, but I have more planned - for example, Dustpelt and Runningbrook become mates, Russetfur and Sasha have a litter (sired by Oakfur as a surrogate), and Hawkpaw, Tadpolepaw, and Mothpaw join WindClan, RiverClan, and ThunderClan respectively. 

I like this one. The series just kind of vaguely hints that Scourge and Firestar are closely related and doesn’t do anything with it. It’s like making them related was a afterthought after they wrote The Darkest Hour.

Even though I'm not big on FireSand, I can definitely appreciate some good step mom rep! Streamkit and Sparkkit are such good names too!

If there was a cat I could personally let Fireheart/star move on with after what happened with Silverstream in my own AU though, it would be Goldenflower. FireGolden (or the better ship name of GoldenFire) is yet another one of my favorite AU ideas and ships! Although that makes things weird between Brambleclaw/star and one of Firestar's daughters in such an AU since they would be step-siblings who later became mates and that's just a rather uncomfortable dynamic. No matter, I'll just stick to my "Firestar stays single after Silverstream dies" storyline for this one then!

Here's my version of the SilverFire (once again the better ship name for them) kits:

Wishpool/big dark silver and black tabby she-cat with deep blue eyes
Personality: calm and graceful
Mentor: Frostfur
Mate: Hawkfrost

Dreamcloud/big light silver and black tabby she-cat with soft blue eyes
Personality: kind and thoughtful
Mentor: Cloudtail
Mate: Brambleclaw

Hopelight/big pale silver and black tabby she-cat with clear blue eyes
Personality: gentle and careful
Mentor: Whitestorm
Mate: Rainwhisker

And yes, all three of these fanon SilverFire daughters read themselves rather Mary Sueish (is that even a word?) which is probably due to them being three of my very first OCs I had ever created at that point as a tween back in 2008. But I have so much nostalgia for them that I just cannot bring myself to change anything about their existence now. The addition of mentors and mates came a bit later in 2011 when Dawn just got released in Germany and I thought Hawkfrost was the best thing to happen in this series at the time (quite cringey of teen me but oh well).