Fun, cute, sweet, and sassy, with a side of occasional violence - perfect! Others have gone over the details of this show, so I'm just going to say I loved it. Watching this trio of misfits becoming a real family in the most bumbling but sweet way (while taking out spies and assassins and overly-protective brothers) is lots of fun and heartwarming as well.
Twilight/Loid (real name unknown) is wonderfully genuine as a long-time loner with no idea how to be a part of a family but you can see him gradually falling into the trap of caring for them. Yor is delightfully airheaded but deadly when it comes to her side job and also protecting her new family. Anya...the entire show is worth watching just for her facial expressions - seriously. Plus, she's adorable and funny.
Just watch it.