But nah, she is an assassin, so she is at least 7th lvl, evil, and has poison use so she's cool with me.
Evil? So far she hasn't done anything I see as being evil. She has been a prisoner of an evil drow. She's helped a good king escape ... twice! No, I don't think she's evil. And while D&D states that assassins are evil (or so I recall), that doesn't mean that Mr. Morris requires that of assassins in his universe. Perhaps she only kills evil people. That would explain how she ended up in Archne's dungeon.
Actually, while Clover has had a rough time and I like her, I don't want her to leave with the king of Drostardy, as it would likely mean she'll effectively disappear from the comic. And we wouldn't want that, right? So since she is a fairly established character and I find it unlikely, that the kingdom of Drostardy will become nearly as important as the evil creatures' cave, I actually expect her to be back - sooner or later, one way or another.
Mr. Morris, do you see how Clover's fans are already thinking she is gone from YAFGC? By the way, it also seems that King Drostardy is liked by us fans as well. Personally, I'd prefer that we follow Clover and King than return to the evil cave.
Now before people scream bloody murder about the above suggestion, what about a spinoff? Think of all the palace intrigue, politics, glamorous balls, harems, visiting diplomats, passing-through trade caravans, and so forth that you could explore with Clover and her king. Hey, how about that as the spinoff's title? "Her King"
What? No, I am not smoking anything illegal. No, I am not drunk. Yes, I can count backwards from 100. Hey! It was just a suggestion!