Temmie from Undertale.

🦊 Kill Furries for no reason!

Brown hair. red eyes. Pale skin. She likes knives and blood and chocolate, but not milk. fluffy loves it too. After leaving underground, she got resurrected by Frisk. Freaks out when her "sister" Frisk flirts with everything. Hates Sans. Maybe her heart is cold to people, but maybe someone will be able to melt her ice of hatred for people. She's an adult, of 19. Lives in the Dreemurr family: Asriel is alive and well. From Undertale

Undertale: True Pacifist. Best girl.

Shinobu displays a rather angry and annoyed aura like she wishes to not be in certain situations. She is rather sharp-mouthed and talks back when she wants to because she believes in always standing up to herself. She is rather cold and doesn't show many emotions and doesn't react to things she doesn't need to react to. 
But, under all this, Shinobu is a kind person and deeply cares for those she loves and respects like her sister and parents who she says that she loves with all her heart.

Emotionless, Annoyed, Very rude, Talks back.

Ari is an Ice-type magic user which he uses the power of ice to defeat his enemies. He can summon the powers of the Sage to enter different Sage Mode variants. He's also kind and helps the ones in need. He also has a powerful eye ability called "Copy Eye", which lets him permanently copy any move he sees and he can also copy movements to build up speed. Character from AIT (Ari: the Interdimensional Traveler), an unofficial and unreleased anime. He is unwilling to disclose his girlfriend's name.

Just a silly guy

Mitsuri is said to always be rather annoying by Shinobu who said that she was also the most disliked Hashira due to her bratty-like attitude. She is also said to throw tantrums when she does not get what she wants and makes a big fuss over such little things.
But, overall, Mitsuri isn't a horrible person as her being a Hashira meant she has saved plenty before, something that she would gloat about yet still be proud of this achievement as she made people's lives less miserable. 

Extremely rude, Prideful, Bratty

Giyu Tomioka is one of the main characters of Demon Slayer: Inverted. He is a Demon Slayer in the Demon Slayer Corps and is the current Flame Hashira. He is the student of Sakonji Urokodaki and the friend of Sabito who lost his life at the Final Selection. He became a Hashira to make a change to the way people lived and make an example for the so-called "weak". His appearance is identical to the Original Tomioka Giyuu except he has a smile plastered to his face in every single situation. 