If I can be excused for reposting my query: do we have an official list of characters who are abandoned, and therefore (more likely to be) allowed to be worked on by randos?
tl;dr The only ones I'd actually bet on are characters with so little content they're essentially unnamed, like the elf boy with a big "Would you like to permanently remove this content from the game?" button, and if you're lucky you might eventually get the privilege of writing a Cait cuck scene. No, that's not a joke. But if you bear with me I'll more fully answer that and give advice to aspiring writers for this title with my experiences. I'll post a second tldr at the bottom. Kazuo has been abandoned since he was released. I'm a shit writer so I failed at making a corrupt epilogue, and the most constructive criticism I got was to make scenes for a preexisting character, not an original one because originals are even more work. I saw Kazuo and noticed I identified with him, being connected to his puppets, he's a male character so dev interest would be minimal, nobody was publically working on him, his foundation was already there, and was going to give him tweaks but painstakingly try to incorporate what little lore already existed for him and the kitsune. I had to ask on discord multiple times if it was ok if I wrote some stuff for him because everyone, even Savin, were talking about Fire Emblem or making Carmen jokes (which is a joke in itself), on the official CoC2 channel. I finally get told that 2 users are already working on him, one of which didn't even have him listed on their projects, and they didn't even know the name of the other user. Finally Tobs says
Well I figure, you know what, I don't like him, but I like Kazuo well enough. So I'd just do the aspiring hire thing of starting a frame work to hopefully earn trust. I even created a completely new account, to get a clean slate and change my personality in favor of the workman's "Yes sir, no sir, ty sir". I made the error, I suppose, of figuring I'd earn his trust that way so spent like 2 days on a script, this time using an accepted character's script as a tutorial on parsers, choices etc., because I figured I could have done at least as good as that writing. After almost finishing the introduction, I decided "well that's like 4 or 5 pages in google docs, there's several threads wip so I'll post mine, give a outline of my goals, plans and saying I wanted to stay true to tobs characters so i'd welcome his input and be willing to make large alterations (which is more than most do, even tobs himself lmfao). I get a post from one of the 3 or 4 people who apparently stay on fenoxo browsing threads 24/7 (no shade meant but I'm not joking) if I asked tobs for permission. So I say "i'm terribly sorry dear friend, i'm new here, i'll do so at once" and post in the thread he linked. no response from tobs, i get one response from someone saying, "you're new here so nobody's going to trust you with that character". Still no response from anyone important, then the thread got unceremoniously nuked. Which sure is awful funny, because I made a thread prior about a epilogue, people seemed passive aggressive so I fired back, later regretted even talking to anyone there or writing in the first place so just decided to change the thread and my own passive aggressive comment to "please delete this". Still there last time I checked btw. I'm going to be blunt, myself and say don't write for them. Go to the monster girl encyclopedia wiki, pick 3 at random, make them boys, girls, or futa, and write about your mc banging them in various ways and/or falling in love with them while listening to music, or just straight up read the pages and fantasize. You're not going to get paid for quite some time if at all, you'll have to walk on eggshells the entire time, and have to track down each author like an annoying fly to ask them for permission. If they say no, then you'll have to track someone else down. It's as fun as it sounds.
Second tldr, if you want to write for coc2, if you come here, do not shitpost with jokes about the devs. Do not talk about them at all anywhere, or use another account to do so with no connecting information. They view it or others wanting brownie points will view it and say "look what this person said". Put random comments everywhere on fenoxo. Again, not joking, too few posts, you're not going to be "trusted", to write about a fox boy giving a frog futa a good dicking. If you want to write for them, you don't get to choose or invest extra effort to write what you care for, it's safest to start just writing Cait fucking a tree while the player character watches or giving someone a bj, or completely creating an entire character from the ground up with excruciating detail and parsers. eventually you might get the privilege of writing for a named abandoned character, or pull an alypia and come from absolutely nowhere with like 50 oc commissions getting banged by etheryn and get chucked a party member.
If you still insist on writing, here's my framework I started on, too much effort to just burn it but it's essentially worthless now. It will give you a idea of the first steps of choices, the parsers (little commands for choices or descriptions like [pc.hair] etc) and how you generally format stuff
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and here's a unrelated script of a character that got in, for a full example
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my plan was for Kazuo to be hungry similar to how miko gets in her impreg scene, he lashes out, you wind up helping him platonically or romantically which creates a catalyst for him to be connected to the mc. from there you'd help him with his projects, gathering materials and upgrading his puppets and fighting them, leading to him creating a small line of musket puppets to protect the den, keeping in line with jap culture, but their materials would be rare so they could be justified in not marching everywhere etc. eventually getting a musket puppet summon, and gradually get more and more involved with him which ideally would have hopefully led to a rindo-esque marriage thing. gender wouldn't matter, he'd have scenes for both, his hair's tied up so room for sex scenes to have him with flowing hair. he'd be a workaholic that's champsexual. he'd talk about puppets and how he gets attached to them like they have souls, again a thing also in japanese culture, and it's implied he cut off his arm which is now wooden to have advanced his career, and he has what appears to be wrapped cloth on his arm and legs which could be shown to cover scars if you wanted, so there'dve been drama and kept with the trauma themes in the den about that. if anyone wants to use any of that, be my guest i don't care anymore.