Not your 10 worst characters, but who you feel personally if they left the show it wouldn't have much of an affect on the story? The show can be currently on air or finished, it doesn't matter.
Anyway here's my 10 most pointless characters.
1. Chloe (Stargate Universe)
2. Kala (Sense8)
3. Prince Charming (Once Upon A Time)
4. Lori (The Walking Dead)
5. Lloyd (FlashForward)
6. Olivia (FlashForward)
7. Ford (Stargate Atlantis)
8. Sasha (The Walking Dead)
9. Daryl (The Walking Dead)
10. Juliet (Lost)
As I've said it's most pointless not who you dislike the most, as my list would definitely have Spike from Buffy The Vampire Slayer on this list otherwise.