Jashin-chan

Jashin-chan (邪神ちゃん) is a self-centered serpent who was summoned from Hell by Yurine. She possesses regenerative abilities which allow her to revive herself after her actions lead to bloody vengeance from Yurine.

The Japanese word "Jashin" (邪神) means "evil god"

Appearance
Jashin-chan has long blonde hair with light blue ribbons tied on both sides and blue eyes. Being a lamia, Jashin-chan's lower body is that of a green snake.

Personality
As a person, Jashin-chan has a whole set of bad traits like open selfishness, gluttony, arrogance or even immorality when she manipulates the kindness of Medusa or eats the bento that Yurine gave to pauper Pekora. And despite the fact that she regularly receives various punishments for her bad deeds, Jashin does not extract any lesson from this.

Being a rather unsympathetic person, Jashin-chan may appear to be a villain in this series, she is a good person at heart, although she tries to hide this behind tsundere behavior. This is most noticeable in her relationship with Medusa, when she even invites her to walk together on the seventh episode, in order to apologize for her offensive behavior and use the opportunity when she can go out without a paper bag.

She also has been shown to be quite stupid, lacking basic critical thinking skills and being unable to learn from her mistakes. She once spent over 17,000 years in a time loop, repeatedly losing at pachinko.

Yurine Hanazono
Jashin-chan was summoned to Earth by Yurine for no reason other than just to see if she could. She was unable to return Jashin-chan to Hell herself, as the grimoire which she used to summon her did not contain the return spell. The only other way for Jashin-chan to return home is if she kills her summoner, and as such, she spends each day unsuccessfully trying to kill Yurine while simultaneously spending time with her and various acquaintances from Heaven and Hell.

Yurine takes it upon her self to punish Jashin-chan for her bad deeds, usually in a relentlessly sadistic and bloody manner.

Medusa
As best friends since childhood, Medusa and Jashin-chan share a strong, sometimes even intimate bond, more like a married couple from a caring, simple-hearted wife and frivolous husband, which reminds Yurine of "boy-girl relationship". In this relationship, Jashin often plays the role of an abusive parasitic "husband" who shamelessly manipulates the kindness of her "wife" Medusa, constantly using her as a cash machine and manipulating her at every opportunity.

At the same time, at critical moments of their friendship, she is able to be quite sentimental, jealous and even openly admits that she is unable to function normally without Medusa, using for this purpose such words as "aishiteru", which is considered to be one of the strongest Japanese words for expressing platonic or romantic love for someone.

Even though Jashin-chan continues to have a toxic effect on Medusa and use her as a cash machine, their near-family relationship continues to be emphasized throughout the series, when Medusa gives her chocolate for St. Valentine's Day, or when Jashin-chan invites Medusa to a near-date to apologize to her.

Minos
Minos is another childhood friend of Jashin-chan's. When Minos transferred to Jashin-chan's school, none of the other students would play with her because minotaur are stereotyped as being violent and dumb. So she played alone during recess, until Jashin-chan approached her and invited her to play dodgeball. They've been friends ever since.

Jashin-chan Dropkick
Jashin's signature move is her dropkick, in which she uses her snake tail as a spring to launch herself into the air, landing with a devastating blow. This is usually ineffective.

It's a running joke in the series to point out that Jashin-chan doesn't use her dropkick much, despite the series being named after it.

Regeneration
Jashin's powerful regenerative abilities render her effectively immortal. Whether she's maimed, decapitated, or minced into mush with a chainsaw, she is always able to completely recover in a few hours. Despite this, Jashin claims she is still able to be killed with a gun, and

According to series creator Yukiwo, the source of this power is an orb inside her head that was placed there because she's a "chosen devil". As long as the orb remains intact, she will not die.

Royal Copenhagen
Jashin-chan's Royal Copenhagen is an ordinary punch. Sometimes a strange energy can be seen surrounding her fist, but this is likely just for dramatic effect. The move was named after a Danish porcelain manufacturer which she thought sounded cool

Jashin's Special Ability
Jashin-chan has the ability to throw dice and have then land on whatever number she wants. As a kid, she would use this power to win games of sugoroku. Due to her low intelligence, she is unable to utilize this ability in a useful manner.

Laser Eyes
Jashin-chan can fire laser beams from her eyes. It's powerful enough to light Yurine's skin on fire.

Trivia

 * Jashin's wallet has Yurine's contact info embroidered in it.
 * Jashin comes from aristocratic lineage. Her parents run a business conglomerate in Hell.
 * "Jashin-chan" is actually a nickname. Her real name is too long to pronounce.
 * Jashin-chans favorite song is Holst's "The Planets". Her favorite planet in the song is Jupiter.