Woaw! They all sound so interesting! Could you maybe tell us more about your iterators and a couple slug cats of your choice?
I'll start with Daybreak (She/her). She is one of my favorite OCs because she is such a tragic character. She is the Administrator of the Local Group of canon Iterators (plus some OCs) because she was built as a prototype. She isn't locked to her structure, but the Ancients realized making Iterators who were "off the string" was too expensive, so Daybreak was the only one made who wasn't attached to her structure.
She loved Sliver of Straw, and when Sliver passed away, she was absolutely heartbroken. Despite being the Administrator of the Local Group, she cut off her Communications because she was so upset. She watched Sliver die. Sliver was killed by Angel (@twilightscug's oc) who, at the time, had just been a pup and was doing what they thought was right. This was their purpose, right? To Ascend living beings, to send them away? Daybreak was furious.
When Sliver came back as a Slugcat, she reunited with Daybreak. Daybreak has been scheming, planning to properly Ascend the Local Group so they don't have to feel the pain Daybreak went through. She wants everyone to live in the Great Beyond, free from their prisons, free from their emotional turmoil. Pebbles was dying from the Rot, Suns was suffering because he can't contact Pebbles, same with Sig, Unparalleled Innocence is bitter because of her experiences, Looks to the Moon is on the verge of collapse because of Pebbles, and Souls Left Behind (a self-insert for Twilightscug) was going to collapse eventually.
She wants to free them. She wants to save them. So, she partners up with Sliver and Angel, believing Angel has what it takes to free everyone. She didn't know Angel was not the Triple Affirmative, but rather the False Affirmative.
This isn't helped by the fact that Daybreak is under Orders from an Ancient who never Ascended...
Purity (She/they/it) is a Slugcat that was made by Daybreak. She is a proper Triple Affirmative, a successful one. She can actually Ascend things, similar to Saint (who Sliver thought was a failed experiment, hence why Angel was created). I haven't fully developed her yet, but she's one of the main villains along with Daybreak (though they both get redeemed later). She believes she is doing something right. She wants everyone to be free, too.
Nothing Sacred (He/him) is an Iterator who is incredibly tragic, too. He's spent many cycles studying the Rot and attempting to harness its abilities and powers ever since Seven Feathers Upon Astral Planes (now known as Astral) tried to study the Rot, too. He wants to use the Rot for good, to have it help instead of devour. This doesn't work out, and he ends up creating Sentient Rot (like from the Watcher). His puppet and his entire region around his Superstructure becomes infected, and he's basically controlled by the Rot. The Rot tears him from his structure, severing his mechanical arm and umbilical, and he becomes basically an Iterator version of Hunter Long Legs. The difference is that he's fully conscious and aware of what he's doing, but he can't stop the Rot. It's basically a parasite piloting his body like that one zombie disease fungus that affects ants.
The Void's Echo (they/them) was close with Nothing Sacred, maybe even crushed on him. Unparalleled Innocence was part of this little trio, so she was also close with both of them. The Void's Echo, ever since Nothing Sacred stopped responding and was presumed deceased, began to study the Rot to try and figure out a cure. They are far more careful with their studies, working to try and prevent future instances of Rot infestations if they can. They succeed in creating a cure, but their structure is in a horrible state. You see, as punishment, their old Administrator (one of the Ancients) destroyed a part of their structure and Communications because Void was so defiant and tried to protect Souls Left Behind (they/them) from their own Administrator. As a result, Void is also close to collapsing, and can't even contact anyone. They've been alone for a very, very long time.
Vortex (he/him) is a Slugcat purposed organism made by Void. He was originally made to send pearls to fellow Iterators when their Communications were destroyed, but he stopped doing so because Void's condition began to get worse. He wants to be there for them, and if anyone shows up at Void's structure, he can guide them to Void.
Seeks the Thunder (he/him) is an Iterator who managed to break free of his taboos and rules. He was always rather defiant, and was often punished for it, until one day, he had enough of his treatment. He thought he was going to die when his Administrator was punishing him. He didn't want to die. He didn't want to die! ... He ended up killing every Ancient around him, and permanently shut off his Communications afterwards. He's also the only Generation 4 Iterator, besides Souls Left Behind, and they didn't know about Thunder until they meet him at a later date...