For as long as they can remember, Kai, has always been fighting, it is for that reason that he is the most innate fighter of the ninja team.

But the real problem is that Kai has never, ever, taken a real break.

After losing her parents, Kai became the emotional support of her little sister, Nya, apart from being the only one capable of taking care of her and raising her, that is why he decided to become the "man of the house". At an early age he had to do many things in order to survive and give Nya everything he needed so that he could continue to live well, but if he wanted to be strong to protect Nya, he had to learn to defend himself from other people. Since being just a child with no one by his side, it would be easy for some to take advantage of him and do a greater harm to him and his sister. Anyone would say that only a 5-year-old would accomplish nothing by fighting, but Kai would fight tooth and nail if it meant keeping his and Nya's home safe from the dangers of the world.

He was lucky to memorize one of the fighting techniques that he once taught him, as well as some blacksmithing techniques so that he could continue the family business. Kai had become the strongest child in his town, and thanks to his training to handle a heavy hammer, it was easy for him to deal with children older than him. Apart from the fact that he has not stopped practicing with a wooden sword that his father had once given him.

His strength and ability in the fight made him earn the respect of the other children in his town, but also the contempt of some, since they only wanted to teach Kai a lesson about not bragging so much about his strength. In addition, this fact made Kai never manage to make friends, since all the children feared him for being a fierce fighter, also, that never mattered to Kai, he was never interested in making friends, he only focused on taking care of Nya , to whom if he gave the opportunity to lead a more normal life than what he had.

Perhaps the blow of loneliness led him a lot to mistrust, but that never mattered to him.

Every time someone messed with his sister he would not hesitate to teach a hard lesson to anyone who dared to upset his little sister. Nay still had the childhood habit of going to play in a small park in the town to be able to be with the other children her age, it was fortunate that she was more sociable than her brother. But even so, the older children who hated their brother took advantage of this and teased her so they could take out their hatred for Kai on her, but even so, they should already know, that if you mess with the little sister of a certain fierce boy , you would have to face the consequences.

- What the hell happens to you?! - shouts one of the children as he is rubbing his beaten cheek after a certain brown-haired boy with spiky hair hit him hard in the face.

After Kai came to the rescue, Nya wasted no time hiding behind his brother and crying as she hugged him.

- If you dare to bother my sister again, I swear this will be the last time you try to mess with her! - Kai answered fiercely - Anyone who messes with her will deal with me, her older brother of hers! -

- You'll see...him! -

The group of older children ran towards Kai who told his sister to stay away from her while he took a defensive pose. Nya listened to her brother and hid behind a nearby tree while she watched the children fight Kai.

As soon as Kai started his "epic fight" with the group of four, Kai was unfazed for a second, he managed to land several hits that left the children confused, but even so, that did not prevent him from getting hurt too, several times. they held down so they could hit him in the stomach or chest, but Kai always managed to free himself, be it between low blows, kicks or hair pulling. Kai being small was quite agile, even when facing a group of boys older than him, the fight was in Kai's favor. Kai was blinded by the fight, he was thinking of nothing more than to finish them off. Very soon the fight was over, and the group of four had only to flee like a bunch of chickens.

- L-Let's get out of here! - One of the children cried while covering his face, beaten and full of bruises.

- You will pay us! Did you hear?! You will pay us little monster! -

After cowardly running away, they left behind a now beaten and tired Kai as he wiped the blood from both his split lip and his nose. Despite the pain in his injuries, Kai still had the will to continue standing, he had great resistance despite having a somewhat thin body from lack of food and fragile. Letting out a long sigh, he turned to the tree where Nya had hidden.

- Nya, it's okay, now you can go out - in that she saw how her little sister shyly came out of her hiding place, and when she saw that there was no danger, she ran towards her beaten brother who hugged her tightly while she sobbed on his shirt while he It was around his waist - You no longer have to fear, those fools have already left and I doubt they want to mess with me again - Kai said, showing a mocking and proud tone he did with his sister.

- Brother... - he sobbed as he wiped away his tears and looked at the face of his brother - Are you okay? Do your wounds hurt? -

-Quiet, I'm fine - he calmed her while she showed him a comforting smile - Come on, let's go home - he said as he knelt down and let Nya climb on her back. When he felt her surround her with his arms and her legs, he stood up and walked down the path that led to her home.

- Coming home, would you let me heal your wounds, Kai? - Nya asked innocently.

- Sure, anyway, they don't hurt much anyway -

Yes, Kai was a tough kid to beat, and that was due a lot to his impulsiveness and his stubbornness.

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Now that Kai is a respectable ninja, his desire to fight grew more and more as the fight fueled much of his inner fire and himself.

He trained relentlessly the time the skeletons kidnapped Nya, but after recovering her he started training only to be stronger than his teammates. Despite having a bad relationship at first, Kai learned, for the first time in his life, to trust other people. Cole, Jay and Zane became best friends for Kai, they became his new family, just like Sensei Wu and Lloyd, Kai would not hesitate to give his life for them.

He trained more and more each day, even training secretly sometimes, something that even Sensei Wu did not know. How to know that his fiery fiery student was training in secret?

In addition, he insisted on doing solitary missions sometimes in order to guard the city, since after saving Lloyd from the volcano, the serpentine activity grew too much. Since if Pythor was still free, Kai feared that he would make a new plan that involves destroying his family.

At first everyone thought that Kai would take a break once he saved Nya and took her to a new home, but that was not the case, Kai still trained relentlessly. He had a lot on his shoulders, besides, he focused on being the Green Ninja, but upon discovering that he was Lloyd, Kai focused on training to be strong for Lloyd and be able to protect him. The desire to fight never left his body, and now that he had a golden weapon at his disposal, stopping it was almost impossible, since if you face Kai, it is as if you were facing fire itself.

No matter how many blows or wounds he received, Kai never gave up, even birds denied the help of his friends to tend to their wounds, and that he did not want to appear weak in front of them, he even lied to them when he hid a wound and told them that he was fine.

But this problem was increasing more and more, even and the others began to worry about Kai, it bothered them very much that he showed a hard face every time he returned from a mission, or that he told them that he was fine when they clearly saw how hurt he was. He had more and more wounds. But they shouldn't have bothered him, since they knew Kai gets irritating every time he evades them.

That ruco already knew Nya, after all Kai raised her and she was tough with him for as long as she can remember, strangely there were times when she beat Kai in an argument every time they talked about her well-being.

- Kai, are you sure you feel okay? - Cole asks worriedly as he sees Kai limping down the aisle of the ship. The two of them had just returned from a fight with the Serpentines and Cole had a suspicion that Kai was hiding a serious injury.

- Of course I'm fine, Cole. You don't have to worry about me too much - he insisted as he continued walking down the hall.

-But...if you're limping - he pointed out as he saw the red ninja limped every time he took a step. Kai denied this and continued on his way.

- There he goes again - Jay exclaims as he approaches Cole's side and sees Kai's slight limp.

But suddenly, without warning, Kai fell to the ground in an exhausted mode, luckily Cole and Zane helped him up quickly while holding each other's side of him.

- I'm fine... I'm fine, okay? - Kai insisted as he allowed himself to be helped by his friends.

- Kai, clearly you don't look good, you can barely stand up by yourself - Cole started with a hard and worried tone - They must have injured you during the mission, come on, let's go to the infirmary to get checked -

As soon as they got to the infirmary, Jay told Nya what had happened to Kai, and she did not hesitate to go to her older brother to finally attend to him. Nya had told the others that she was in charge of taking care of Kai, so the boys left Kai in Nya's care without saying anything else, apart from the fact that Zane also stayed with them since he was the one who knew the most about medicine. .

- Ouch! - Kai complains when Nya touched one of her serious injuries with a wet cloth.

- Kai, stop behaving like a baby and stay still while I clean the other wounds - Nya scolds him - If you want me to finish treating you soon, listen to me and behave -

-Yes "mama" - Kai responds sarcastically as he looked away.

- If you really want to avoid this again, you better be more careful in your fights and missions, Kai - Zane replied as he bandaged his side with a bandage. Clearly Zane already looked eager to tend to Kai.

- Of course I'm careful - he defended himself.

- Well, it seems you don't have it - Nya asks.

Letting out a frustrating grunt, Kai gave up, as he knew that this time he would not win this argument with Nya.

After they finished caring for him, Zane helped Kai into his room and put him on one of the downstairs beds. As a last order, Zane told him to rest and no exercise for a few weeks. Something that Kai didn't like. After Zane left, Nya was the one who stayed with Kai.

- Please, Nya. Don't let me lie here for days, I'll go crazy if I don't do something - Kai pleads as he looks at his sister.

- Kai, this time I have to agree with Zane, and I will be clear with you. Why don't you take a break? -

- A break? - Kai questions sounding confused.

- Do not think that I have not seen you train without any rest, even Lloyd has told me that he has seen you train at night, and lately these days you have been full of cuts and blows and you have not even allowed yourself to be attended by Zane or by my -

Kai wanted to say something, but in the end he closed his mouth and said nothing more.

- I know you don't want to worry us, but ... I wouldn't feel good if I saw you hurt all day, I would like you to at least take a break and let us take care of your wounds -

Taking a good look at Nya, Kai knew immediately that he had worried her too much, something that she didn't want to happen. Kai thought better of it and maybe now it would be better to stop worrying his little sister and take some breaks.

- Okay, I'll take a break -

- Can you promise me? -

- If I promise you -

- Thank you, Kai - Nya said, showing him a sincere smile of appreciation.

- All for you, little sister - Kai said sincerely as she smiled back at him.