Cavernous Sysboxes

Userbox/Sysbox account of @thosecactussharks

This blog will contain all of the userboxes and the occasional system terms that we make for ourselves and other CDD systems. This is strictly anti-endo, and we would ask that endos not interact and instead block this blog immediately. We will block if we see any endos that happen to land in our notifications.

We cannot stop endos from interacting, but we ask out of courtesy as we would prefer endos go to other endos for their userboxes instead of using ours.

Requests: Open

Read request guidelines carefully or we may not respond!

Userbox Masterlist [ X ]

DNI directly below the cut. We block freely.

This [ noun ] does not want to be called "plural"

These userboxes are completely free to use, please just read our pinned beforehand, like or reblog if you use them, and do not remove the watermark!

If you would like to request a userbox, please read our pinned post to see request availability and the guidelines we use before sending an ask! Otherwise, we may ignore or delete it to keep our inbox clutter-free!

This [ noun ] is a Jason Todd fictive/introject

(Text background image credit: X )

These userboxes are completely free to use, please just read our pinned beforehand, like or reblog if you use them, and do not remove the watermark!

If you would like to request a userbox, please read our pinned post to see request availability and the guidelines we use before sending an ask! Otherwise, we may ignore or delete it to keep our inbox clutter-free!

Last Updated: 5/13/2026 [ Check back often for updates! There will not be notice for updates unless if there is other reason to announce it! ]

USERBOXES

∥ BOUNDARIES

× This [ noun ] is anti-endo, please block and move on [ X ]

∥ DISABILITIES / DISORDERS

General

× This [ noun ] is disabled [ X ]

AuDHD

× This [ noun ] is AuDHD [ X ]

∥ GENDER

Masculine

× This [ noun ] is transmasc [ X ]

SYSBOXES

∥ GENERAL

System Structure

× This [ noun ] is fictive-heavy [ X ]

Front Statuses

× This [ noun ] is often blurry, please be patient [ X ]

Preferences

× This [ noun ] does not want to be called "plural" [ X ]

∥ INTROJECTS

Jason Todd (DC)

× This [ noun ] is a Jason Todd fictive/introject [ X ]

This [ noun ] is AuDHD

These userboxes are completely free to use, please just read our pinned beforehand, like or reblog if you use them, and do not remove the watermark!

If you would like to request a userbox, please read our pinned post to see request availability and the guidelines we use before sending an ask! Otherwise, we may ignore or delete it to keep our inbox clutter-free!

This [ noun ] is disabled

These userboxes are completely free to use, please just read our pinned beforehand, like or reblog if you use them, and do not remove the watermark!

If you would like to request a userbox, please read our pinned post to see request availability and the guidelines we use before sending an ask! Otherwise, we may ignore or delete it to keep our inbox clutter-free!

This [ noun ] is transmasc

These userboxes are completely free to use, please just read our pinned beforehand, like or reblog if you use them, and do not remove the watermark!

If you would like to request a userbox, please read our pinned post to see request availability and the guidelines we use before sending an ask! Otherwise, we may ignore or delete it to keep our inbox clutter-free!

This [ noun ] is fictive-heavy

These userboxes are completely free to use, please just read our pinned beforehand, like or reblog if you use them, and do not remove the watermark!

If you would like to request a userbox, please read our pinned post to see request availability and the guidelines we use before sending an ask! Otherwise, we may ignore or delete it to keep our inbox clutter-free!

This [ noun ] is often blurry, please be patient

These userboxes are completely free to use, please just read our pinned beforehand, like or reblog if you use them, and do not remove the watermark!

If you would like to request a userbox, please read our pinned post to see request availability and the guidelines we use before sending an ask! Otherwise, we may ignore or delete it to keep our inbox clutter-free!

This [ noun ] is anti-endo, please block and move on

These userboxes are completely free to use, please just read our pinned beforehand, like or reblog if you use them, and do not remove the watermark!

If you would like to request a userbox, please read our pinned post to see request availability and the guidelines we use before sending an ask! Otherwise, we may ignore or delete it to keep our inbox clutter-free!

Now, a few things of note about the blog and some changes with it:

All old userboxes have been privated, as we are not a fan of the designs of them and want to make the blog feel cleaner by using only updated, current userbox templates!

We have updated versions of nearly every old userbox, so feel free to use those new ones in place of the old ones! You can still use the old ones if you want, but we will not be using that template for any new boxes!

I am about to start releasing all of the new boxes in a batch of posts, followed by a new masterlist that'll end up being linked to our pinned post, to hopefully make navigating our blog a little easier!

(It's been a year, but what the heck, might as well do this again now that we have some motivation)