Tomo The Wildcat currently only has custom character support, there are plans for a level editor but we're not promising anything yet.
Check these options for modding:
"Tomo The Wildcat Mod Creator" is included in every Tomo The Wildcat download, as well as an offline version of the documentation.
Information on how to use the modding tool here.
This document is also included in every download of Tomo The Wildcat (data/docs/)
You can download characters from our Discord server or download curated mods on the Custom Characters page.
Post it on our Discord server. and I (Geno) will ask you for permission to include it on the page.