Riri Williams/Ironheart (Marvel)

Ironheart, (Better known as Riri Williams) is the main protagonist of her new Ironheart and Invincible Ironman series. She later took on the mantle of Ironman in a very strange fashion.

Why She Sucks

 * 1) She is a blatant Mary Sue with no personality.
 * 2) Her backstory is rather poorly written, apparently, Marvel attempted to give Riri a tragic backstory to give her more "depth" and more "character development". However, as Literature Devil points out, Riri's backstory is very disjointed and she receives no character growth whatsoever.
 * 3) Like many of Marvel's more recent heroes, Riri's actions are sometimes more villainous instead of heroic. One time she literally stole materials from her school (the Massachusetts Institute of Technology) in order to create her Ironman suit. Another time, she invaded Latveria.
 * 4) Riri Williams only exists just to replace Tony Stark, when yet there was nothing consistently wrong with the latter to begin with.
 * 5) * Even worse in that if they really did need to replace Tony with a black teenage girl, they could have just used Rhodey's niece, Lila Rhodes.
 * 6) Her suit's design took a step down from Stark's, barely looking like it was made to battle.
 * 7) She is otherwise a very pointless addition to Marvel Comics, and didn't have a real good reason to become the new Ironman.
 * 8) She is a sociopath and narcissist with a victim complex.
 * 9) She only became a "superhero" because her teacher gave her a sarcastic answer that she wanted to hear so she could "prove her wrong" outta spite.
 * 10) She is self-centred and does not accept her mistakes.
 * 11) She's a creator's pet.
 * 12) Despite supposedly being smarter than Tony Stark she has never managed to create anything he hasn't making her intelligence an informed ability.

The Only Redeeming Quality

 * 1) She is a very intelligent character, and also happens to be even smarter than Tony Stark.

Trivia

 * Riri Williams is apparently 15 years old in the comics.