Requested feature overview description.
User names in blips should be clickable and lead to the user page
Example:
https://e621.net/blip/show/81445
https://e621.net/user/show/69399

Why would it be useful?
So you can find out more about people whose names you see in https://e621.net/blip/index

What part(s) of the site page(s) are affected?
Blips

This could be harder to implement than you might think.

If you click the @ symbol and get "\@TheHuskyK9:\":/user/show/69399 instead of \@TheHuskyK9: , that subtracts another 19 from the blip character count. The real Twitter made changes years ago to minimize things like that counting against your Tweet length.

Double quotes are a valid username character for some reason, so that could be a problem.

That is probably the easiest way. A harder way would be to replace it after the blip is posted. Anyone can write \@notarealusername. Each instance in the blip would need to be checked. Usernames with a colon are a potential problem. Like this user who was active weeks ago. In the rare case that a user gets an approved username change while you are composing the blip, you are SOL.

Neither of these would be retroactive, so the existing 100k blips would not link @ to usernames.