Sooo... for book 1 (The Dragon & The Phoenix) it's just Leo & Mikey & some friends so I'm basically gonna talk about them. 

BOOK 1: 

Leo / player 0001: 

V / A : Ben Schwartz (obvi) 

Weapon of choice : Twin Katana's (I gave him 2 katana's because in my backstory Big Mama breaks his odachi, leaving him with his Battle Nexus weapon(s) of choice, being two red(ish) katana's (stained red with blood) but soon Usagi (get to him in a sec,) gives him two black katana's with gold Hamato symbols on each of the hilts! (that's later tho)) 

Power set : Necromancy (the ability to speak to the dead), lightning & teleporting. (the ooze that was put in him strengthened his Hamato Ninpo causing it to activate more often, his teleporting being more controlled & more strong, and lightning but doesn't have FULL control over it yet.

Player number : 0001 

Position in the Kaibutsu kids : The Leader 

--I DO NOT OWN THIS ART! KUDOS TO WHOEVER MADE IT THO, IT'S AWESOME!--

Mikey / player 0002 : 

V / A : Brandon Mychal Smith 

Weapon of choice: different types of laser guns. since his kusari-fundo was destroyed by Big Mama, he started to collect different laser guns (the hidden city mostly uses laser guns, humans don't.) -I will get to the different types of laser guns in a second-, keeps a laser gun holster on his leg & his back. 

Power set : Necromancy (the ability to talk to the dead), Pyrokinesis / flames & Hamato Ninpo (same as Leo, the ooze put in him strengthened his Hamato Ninpo, giving him flames & Pyrokinesis) 

Player number : 0002

--DON'T OWN THIS EITHER, BUT STILL THIS ART IS AWESOME-- 

Alopex / player 0021 

V / A : Seychelle Gabriel (legend of Korra)   OR    Dove Cameron (Liv & Maddie / Marvel: Rising) 

Weapon of choice : 2 Kama's, used as a Japanese farming tool, it was later put to use in battle! these weapons are her OG weapons so I decided to keep them! P.S Alopex is NOT a oc, look her up if you want to find out more. In MY story however, these were her weapon(s) of choice for the Battle Nexus. 

Power set : healing abilities, extreme senses & extreme agility

Player number : 0021 

--DON'T OWN ART IT'S BEAUTIFUL THO!--

Kiran / player 0004 

V / A : Bobby Moynihan (we bare bears / Ducktales 2017) 

Weapon of choice : none. uses tech a lot & puts his own tail to use, but no specific weapon

Power set : camouflage, use of his tail, agility

Player number : 0004 

Description (since I don't have a photo) : an emerald green lizard, square(ish) snout, claws, wears over-sized tee's & blue jeans a lot, wears a lot of his own tech, is basically Donnie but not as sarcastic & rude (and not as evil either, lol). 

Rose / player 0014 

V / A : Karen Fukuhara (She-ra & the princesses of power)  OR  Meg Donnelly (Zombies 1 & 2)  

Weapon of choice : Magic /  Staff 

Power set : Magic (get to magic types later..) 

Player number : 0014 

Description (since I don't have a photo) : blonde hair sort of an Alice (twilight saga) haircut, pink-toned fingertips, wears a white gymnastics suit that covers her entire body, yellow eyes (but change to pure white when doing advanced spells), has a (very) bubbly attitude, kind of like Cat (victorious / Sam & Cat) just less..um, Cat (if you know what I mean..), has amnesia (can't remember ANYTHING before her Kaibutsu project years)

Other characters from Book 1:  

Charlie / Black Stripe

V / A : Jason Bateman (Zootopia) 

Weapon of choice : Whip, he's able to grab people & hurt people at the same time

Power set : agility, hyper senses, speed(ish) 

Desc : is an outlaw who runs an outlaw-only club; known as the Ember years, he is a Kleptomaniac, flirts with Alopex a lot, Mother got killed in a train accident, helps the Kaibutsu kids when help is needed (usually as a backup army), has a gang as well (known as the wolf pack -bc i'm lazy at creating names-), doesn't get along with Leo till later in the story.

Shinigami / Witch 

V / A : Gwendoline Yeo (TMNT 2012) 

Weapon of choice : Kusarigama & magic 

Power set : dark magic & the ability of telling the future (only a little)

Desc : Usagi's old student, Shinigami is a well known witch, who never helps anyone who won't pay first, meaning in money, something valuable or something of interest for her. She often helps Rose when it comes to figuring out her powers & her past (but that's later..) Her close connection with Usagi still stands & she uses her dark magic to help the Kaibutsu kids fight (sometimes..) When it comes to her future telling it gets tricky. When she has these 'dreams' it comes in metaphors, meaning if someone was to drown to death (don't worry, no one ACTUALLY does,  this is an example) it would show a black room, filled with water & a dead body laying in the dead center of the room, it's not exact but it's a close enough guess. 

Usagi / Miyamoto Usagi 

V / A : ???? 

Weapon of choice : nodachi 

Desc : Miyamoto Usagi is (in MY story,) a rabbit yokai that teaches the Kaibutsu rebels how to fight better, think as one & funds their attacks when needed. He also trains Leo & Mikey to better understand their Hamato Ninpo & how to better control it. He was very good friends with Karai, soon to find out he fell in love with her & has carried the burden of never telling her. Leo & Mikey have the strongest connection with Usagi, for many reasons, obviously. Way back when Usagi taught, he taught Shinigami how to wield her powers. 

BAMM! ALSO KUDOS TO ALL THE ART MAKERS! PS- IF YOU HAVE AN IDEA ON WHO TO VOICE USAGI, PLS CHIME IN! SEE YA NEXT CHAPTER!