"Oh for the love of..." said Tatsuo in an exasperated tone. Though in some way it might have been the truth, it was actually quite hurtful to be treated by them like he was some kind of parasite.
"This, hair dye...it'll come off." he said while reaching for a few strands of hair and immediately taking a bite out of the apple in his hand "And some say the eyes are the mirror to the soul. Thus it makes sense that the soul in control produces different colored eyes, it happens all the time in beings with more than one soul." his explanation was made in part with a cheek full of apple and as he spoke he was reminded once again how little the two kids knew about matters dealing with the soul.
It was no lie, a change in eye color is often one of the most obvious giveaways that the one in control of the body isn't the original host. It's often found in cases of bestial spirits being locked inside a person's body, though often being reserved to more aggressive cases. When another, often much more powerful spirit inhabits another's body their soul's energy is the one that affects things such as chakra and life-force, this produces a radical change in the body's appearance, with the eyes often being the first to change. This does not happen in every case of possession, when a spirit collaborates with the host spirit, therefore not performing an aggressive take-over, their spirits tend to work together in the creating of energy.
Ryuuchi was a clear example of every possible case throughout his life. With a demon sealed away inside his body using an incomplete sealing method, his natural blue eyes started turning golden as the demonic spirit's. Through the first "acceptance" of the demon within himself his eyes became neither his nor of the demon's but a completely different one. As the years went by and the insanity from the demon affected him more and more, his soul began to split, creating a form of split personality and each time one of these fragments of a soul gained control of the host body the eye color changed. When the demon destroyed all but two of the fragments, the red returned but a pact was made and control of the body was shared. Unlike the peaceful merge of energy the result was an eye of each color as the two souls attempted to cooperate but ended up clashing. Finally when the demon was ripped from him the golden eyes were no more, yet the corruption remained, thus the soul retained the red eyes it had for so long.
Though not an exact science at all, since more matters dealing with the soul are obscure at best, there is a pattern that those who have dealt with souls manage to catch.
"She'll be fine, don't worry." a straight up lie from someone quite adept at telling them, though possibly not with malicious intent. Erin was no more, a soul absorbed by his own in the most hostile take-over possible, but he knew full well that telling Ninoya that would only lead to problems that could be avoided with a little white lie.
The apple made its way to the campfire as he stood up, there were other matters to attend to.
"Are you going to sit here all night and argue about how my new look is oh so awful for Erin or can I give you the hand you definitely need right now." he spoke while unraveling the chains around his limbs and letting them fall to the ground "Because there's a couple of rats we should be dealing with first."
His movements were swift and incredibly precise, as if he had been using chains as a weapon since he was a toddler. The chain swung around the campsite, passing mere inches away from Ninoya's face and right above Muryuu's head to finally stop on some trees above them. Tatsuo's grip on the chains as loose and delicate but at no time did it look like he was about to lose them or the control he had over them. His legs suddenly bent and he readied himself for a high jump but as he was about to do so, a large ball of flames crashed from the trees, along the chain and finally to where he stood, creating a loud and earthshaking explosion.
Smoke and dust cleared quickly thanks to Tatsuo's chains. Not only was he safe and sound but so were Muryuu, Ninoya and the whole campsite as several long chains swirled around the small area at a furious speed for a few moments, before slowly loosing speed and decreasing in size. The chain that had caught onto something in the trees was still intact and in perfect shape, but unlike before his grip was suddenly tighter as he pulled on them while spinning around in place.
The result was quite surprising, instead of a hardened and fierce assassin, a young girl with long red hair came crashing down, hitting the ground with a loud thud as the chains around her leg brought her out of her hiding spot. But she was not out, the next moment her hands reached for something behind her back and drew a curved knife with a black blade, not unlike Muryuu's own sword and easily sliced the chain, releasing her foot. The young girl got to her feet the next moment, immediately getting into a combat stance similar to Muryuu's.
"Ninoya, meet Yuuko's lovely twin sister, Aiko." he said in a mocking tone as Muryuu stood next to him with a stunned look on his face.