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vimnail
A vim like image editor, for creating thumbnails, or even animated thumbnails. Written in Rust
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can only find TanTanDev/vimnail after a cursory glance but it seems to only be for possition and animation (no brushes)
Probably not exactly what you're looking for, but something you might find useful is the DrawIt plugin for vim. You can enter a drawing "mode" and can easily draw lines, arrows, boxes, etc. using either ASCII characters or Unicode line segments. This isn't a replacement for a full UML diagram, but can be handy for things like state diagrams or truth tables in comments.