Groot (MCU)

Groot is one of the five main protagonists in the Guardians of the Galaxy films, a supporting character in Avengers Infinity War, and a minor character in Avengers Endgame.

Backstory
this part is too long, check this out.

His PG Qualities
1.He did sacrifice himself to save the Guardians 2.He is kind to kids and really cares about the Galaxy 3. He was originally a criminal that redeemed himself 4.He is really nice to the guardians sometimes.

Why he's rejected
1.He is too violent and lethal; he helped Yondu and Rocket murder ravagers. 2. He is a bit of jerk sometimes, whining and moaning and complaining throughout Infinity War. 3. Although he was still developing a moral agency, Groot blew up a planet (it has to be done to save the universe, but still) in GOTG Vol.2 4. Groot tried to hurt Drax just because he accidentally destroyed a radio. 5. Groot was a criminal back in the day, just because he wanted to be rich, while he became a better person, this really affected the team, as they became more of a Lawful Neutral organization that only became full on Lawful Good in IW.