Dawn Summers (Buffyverse)

Dawn Summers is a recurring character in was a member of the Scooby Gang, sister of Buffy Summers, and daughter of Hank and Joyce Summers. In her original form, she was a mystical power of living energy known as the Key, transformed into a teenage human to hide her from the hell goddess Glorificus.

Why She Sucks

 * 1) She's a constant whiner and has an ungrateful attitude.
 * 2) She hardly helps the Scooby Gang.
 * 3) Her damsel-in-distress role will get annoying after a while.
 * 4) Buffy sacrificed herself for her, which she didn't exactly earn.
 * 5) She has a selfish attitude and lacks empathy very often.

Redeeming Qualities

 * 1) She matures a bit in season 7 onwards.
 * 2) She's not as bad as Kennedy
 * 3) Michelle Trachtenberg always did a great job with the material (plus, in "Once More, With Feeling", she showed off her ballet training).

Trivia
She's #16 on Entertainment Weekly's "The 21 Most Annoying TV Characters Ever" list.