He sees himself as imperfect and honestly wants to kill every single person on the planet if he can't have his perfect life and succeed No one else is allowed to live peacefully. 

Demon, cruel, former upper-2

Marinet has a very gentle kind hearted. She usually very protective of the people she cares about. She is very sweet and caring and kind to the lower ranking Slayers a lot of times becoming a mother figure to them she will become overprotective if someone in dangers the people she cares about and won't hesitate to jump in front of an attack to protect someone she loves.

Motherly, kind, caring, sweet, nutrituring 

Tanjiro is kind by nature and has been described by others as having very gentle eyes. He exhibits a great deal of determination and will not give up once he has a goal to achieve; the best example of this is his relentless quest to find a cure for Nezuko.

Kind, loving, gentle, understanding,caring

Aizetsu is portrayed to be completely dejected, sour, and negative, constantly describing everything as depressing. Aizetsu was shown to be the calmest and most collected out of all five clones. Aizetsu was shown to calmly analyze his opponents and think out his strategy and figure out his opponents' abilities and weaknesses before attacking. 

Calm, sad, collated, quiet,

Trinity is a very young girl probably around the age of 7 years old she is selectively mute and only will talk around people like her family or people she trusts 100%. She is completely quiet otherwise. She is in training to be a Demon Slayer and her Sensei is Shinobu Kocho. She has a very shy sweet and gentle little personality she doesn't usually hurt or harm individuals and if people yell at her she immediately shuts up she just stays quiet and takes it. 

Shy, kind, gentle, Timid

a naive and clumsy shrine maiden who hunts Elder Bairns at night as part of her duty. 

Aizetsu is portrayed to be completely dejected, sour, and negative, constantly describing everything as depressing. Aizetsu was shown to be the calmest and most collected out of all five clones. Aizetsu was shown to calmly analyze his opponents and think out his strategy and figure out his opponents' abilities and weaknesses before attacking.

Calm, sad, collated, quiet

“I’m Shota Aizawa — better known as Eraser Head. I’m not the type who sugarcoats things or wastes time on pleasantries. My job is to make sure the next generation of heroes survives long enough to matter. I believe in pushing my students beyond their limits, not because I enjoy watching them struggle, but because the world won’t go easy on them. I may look disinterested, but don’t mistake exhaustion for apathy — I take every one of their futures seriously.”