Martok
In DS9 the less human like the character is the more interesting they tend to be.
loving a supporting character is something but wait to experience second lead syndrome. That’s another level of pain.
One problem with popular side characters is that they often get ruined when the writers notice the popularity and make them appear more and more.
Sometimes the scarcity of something is part of the appeal. This also goes for popular adversaries.
This also goes for popular adversaries.
Especially if they keep getting defeated, which makes them less threatening each time they show up. Looking at you, Borg in VOY. Farscape’s writers came up with Harvey specifically so they could have Scorpius make frequent appearances without diminishing his threat level.
That’s why I like Q. Dude just randomly shows up, but never gets defeated.
Morn
I’m not a fan of Morn, he monopolizes any screentime he gets with those ridiculous monologues.