For simplicity reasons, Jade and Glaze are humaniod in this studio.
Names and descriptions (from left to right)
(Name, gender, age, relationships, reason for being overall villian/ motive)
Tanja Jae; Female; 23; Girlfriends with Bianca Spion, foster mother to Kiara Jae; Abusive to both her girlfriend and daughter, implied that she's killed over ten different people, motive unknown
Jade; Female; Died in mid 100s but is technically around 1100 during Diamond's Regret; Relationships in life unknown, partially mothers Diamond after Fade's death; Possesses Diamond to have another chance at life, kills the rest of Diamond's family to make Diamond queen, causes an entire war to join all the kingdoms by force. Does all this to feel like she's alive again in her own time.
Glaze; Male; 25-ish in dragon years; Son of Queen Frostbite, secretly betrothed to Queen Basalt (Seawing Queen), brothers with Prince Kittiwake; Captures Kittiwake, plots to kill Frostbite, cursed Nightinggale and Beam to become Flare- A cursed Sky/Night dragonet who turns into a literal monster if she sleeps too long. Motive is to take over all the kingdoms and force crossbreeding so that fights between the kingdoms will be permanently stopped.
Grace Hemlock; Female; 13; Adopted sister named Lia; Because they're in her idea annoying and useless, Grace begins to kill the students in her 7th hour one by one. The only people she spares are the three with conditions; Elise, who has severe anxiety, Tia, who has depression, and Emma, who's a Witch like Grace (and just doesn't know). Her motive is to make things 'fair' and get rid of everybody who doesn't have a mental illness/ condition or doesn't support her. She's the only character where she actually kills off the main character (Emma) in her story.
Hasshyurie Senshi (Hasshie for short); Female; 15; (Unmentioned); Leads a group called the Shadowkage, who, to put it simply, kill people under the assumption that it helps people live after death. It's unknown how or why she became leader or even joined in the first place.