Help with character names

I have characters for a little story I may or may not end up actually making in the future. However, I have no idea what I want their names to be. All I know is that I want the names to be Japanese style names because they sound nice.

So I need name help with her:

The demon princess. Has no right to the throne because each royal family has at least (And usually) one child who looks like a shadow. Teams up with a human in order to dethrone her brother and fix the demon kingdom.

her:

A human sorceress. Teams up with the character above her to topple the demon king (the demon princess' brother) and the cult running the human kingdom. I also need a name for her familiar, a charming but shy girl.

her:

The leader of the mentioned cult. Will end up dying, but not before posing a serious threat. Like the girl above her, I also need a name for her familiar. Also a girl, but an evil and deceitful girl.

her:

A demon who stands outside of the kingdom's hierarchy. Sides with the character on the very top to take down the demon king. Will give her a magical taser.

him:

The demon king (or former demon king) himself. So, umm, remember when I said only demons who looked like shadows could rule the kingdom. Well, he does look like a shadow before his sister tases him and takes over the kingdom. Unlike the cult boss, he isn't completely evil and does have a change of heart after this happens. He's still a little mad at his sister at first though.

Ok, so I used https://www.behindthename.com/ and Google for only one. I'm not sure if the meanings are exactly correct (because behindthename has a chance of being wrong), but I hope you like them (and even if you don't, that's ok)!

The demon princess. Has no right to the throne because each royal family has at least (And usually) one child who looks like a shadow. Teams up with a human in order to dethrone her brother and fix the demon kingdom.

1. Keiko -feminine
   This name means shadow, reflection, respect, benefit, and such.
2. Yuki -unisex
   Means excellence, superiority, gentleness, permanence, hope, brightness, living

A human sorceress. Teams up with the character above her to topple the demon king (the demon princess' brother) and the cult running the human kingdom. I also need a name for her familiar, a charming but shy girl.

1. Aya or Ayane or Ayame -feminine
   Both mean "color" and "design". Ayame means Iris (which is a flower)

The leader of the mentioned cult. Will end up dying, but not before posing a serious threat. Like the girl above her, I also need a name for her familiar. Also a girl, but an evil and deceitful girl.

1. Jun -feminine
   Means pure, clean, simple, moisture
2. Akira -feminine
   Means bright, clear

A demon who stands outside of the kingdom's hierarchy. Sides with the character on the very top to take down the demon king. Will give her a magical taser.

1. Nakano -unisex
   Means middle, field, or middle field, warrior, and wilderness

The demon king (or former demon king) himself. So, umm, remember when I said only demons who looked like shadows could rule the kingdom. Well, he does look like a shadow before his sister tases him and takes over the kingdom. Unlike the cult boss, he isn't completely evil and does have a change of heart after this happens. He's still a little mad at his sister at first though.

1. Mizuki -feminine
   This is a feminine name, but if you want to use it you can. It means felicitous omen, auspicious, and hope.
2. Hideki -masculine
   Means excellent, fine, outstanding, and tree

Hope this helped! :3

Ok, so I used https://www.behindthename.com/ and Google for only one. I'm not sure if the meanings are exactly correct (because behindthename has a chance of being wrong), but I hope you like them (and even if you don't, that's ok)!

The demon princess. Has no right to the throne because each royal family has at least (And usually) one child who looks like a shadow. Teams up with a human in order to dethrone her brother and fix the demon kingdom.

1. Keiko -feminine
   This name means shadow, reflection, respect, benefit, and such.
2. Yuki -unisex
   Means excellence, superiority, gentleness, permanence, hope, brightness, living

A human sorceress. Teams up with the character above her to topple the demon king (the demon princess' brother) and the cult running the human kingdom. I also need a name for her familiar, a charming but shy girl.

1. Aya or Ayane or Ayame -feminine
   Both mean "color" and "design". Ayame means Iris (which is a flower)

The leader of the mentioned cult. Will end up dying, but not before posing a serious threat. Like the girl above her, I also need a name for her familiar. Also a girl, but an evil and deceitful girl.

1. Jun -feminine
   Means pure, clean, simple, moisture
2. Akira -feminine
   Means bright, clear

A demon who stands outside of the kingdom's hierarchy. Sides with the character on the very top to take down the demon king. Will give her a magical taser.

1. Nakano -unisex
   Means middle, field, or middle field, warrior, and wilderness

The demon king (or former demon king) himself. So, umm, remember when I said only demons who looked like shadows could rule the kingdom. Well, he does look like a shadow before his sister tases him and takes over the kingdom. Unlike the cult boss, he isn't completely evil and does have a change of heart after this happens. He's still a little mad at his sister at first though.

1. Mizuki -feminine
   This is a feminine name, but if you want to use it you can. It means felicitous omen, auspicious, and hope.
2. Hideki -masculine
   Means excellent, fine, outstanding, and tree

Hope this helped! :3

Thank you for your name suggestions! Your names are great and, thanks to you, I'm going to use Yuki, Akira and Nakano. Thanks again!

The demon king (or former demon king) himself. So, umm, remember when I said only demons who looked like shadows could rule the kingdom. Well, he does look like a shadow before his sister tases him and takes over the kingdom. Unlike the cult boss, he isn't completely evil and does have a change of heart after this happens. He's still a little mad at his sister at first though.

The names I was thinking that could fit him is Kaage or alternatively spelled Kage. It means shadow. I though it could be fitting because he's supposed to look like a shadow and the name would also convey his royalty. Another name you could use is Kouki which means light and happiness to convey his change of heart. Last, but not least Naoya which means mend, reform, and improve. This name could also convey his change of heart.

Thank you for your name suggestions! Thanks to you, I will be using Kaage as his name. Once again, thanks!

Okay. So now everyone, except for maybe the familiars, has a name. The human sorceress' name is now Kazuko. This name is, according to behind the name, a Japanese name meaning "Peace child".