Not a big deal for now, while number of characters is moderate. But it would be useful to have a "negative" filtering options in the cloud browser. Off the top of my head, hide characters/scenes:
downvoted by me;
with negative rating;
upvoted/liked/OwOed by me;
previously visited;
filter out by tag with "-" prefix.

Also, it would be nice to have the ability to create filter preset activatable by default.