Plot
Donnie gets the change to go out on patrol but as he's out, he sees Cassandra or rather someone who's impersonating her and realizes that he had encountered a shapeshifter yokai.

Donnie was currently jumping to the next rooftop as it was a late night in New York city, the soft shell was finally able to go out on patrol on his own after convincing Raph that he'd be okay plus he'd have his Panic Button at the ready incase he needed back up. Donnie then activated his Flight Shell and jumped into the air, making his way to a location he had marked on his map using his tech gauntlet.

Eventually after some time, he then arrived at a rooftop and landed on the roof safely as his Flight Shell deactivated and Donnie looked around before he heard a gentle 'clatter' of a can, Donnie looked down the alleyway and saw a familiar face, Cassandra. She was sneaking into a warehouse throughout the window as Donnie arched a painted brow in slight confusion.

"Now what is she doing here? And by herself might I add.." Donnie mumbled, he then looked over at the warehouse roof and saw an open part of the skylight for him to get in. Donnie jumped to the roof and almost fell but quickly regained balance as he made his way to the opening in the skylight, he went ninja stealth mode and was able to get into the warehouse through the skylight without being detected. He landed in the rafters and soon spotted Cassandra but noticed her pacing around, this was definitely new to see.

"So this is it.. I'm gonna have to keep running. Again and again.." The fake Cassandra hugged her arms and Donnie noticed that Cassandra's voice sounded a lot more different.. very different. Whoever this was, it wasn't truly Cassandra. The imposter Cassandra kept pacing around until she stopped in front of some crates, one hand balling into a fist.

"Why couldn't this just.. WORK OUT?!" The fake Cassandra punched the crates and the force was enough to make the crates fall and land on the fake Cassandra as dust scattered in the air from the crates.

Donnie saw the dust settle but his eyes widened when he saw the fake Cassandra stuck under the crates, the fake kept squirming and soon he saw that the fake changed forms, it was a yokai. It was a snake shapeshifter yokai. Their face is round with wide eyes and a turned-up nose. Their had a catlike mouth in a "W" shape with two small teeth poking out from their bottom jaw with their lower lip being a dark purplish color (most likely lipstick).

They have pale, light magenta scales and pastel blue splotches on their tail, underbelly and the bottom half of their face. There are tufts of dark magenta colored hair on their head, back, and ears. Their eyes consist of one forest green pupil and one navy blue pupil, black irises and black sclera. They have off-white fins on the sides and tip of their tail.

"What's a Yokai doing here..?" Donnie mumbled, seeming even more puzzled why this yokai took form of Cassandra but his train of thought wondered off when he saw the yokai having a panic attack, clearly in distress but the more the yokai moved, the more the crates put more pressure on the serpent yokai's tail. Donnie typed on his tech gauntlet and pressed a button as his Spider Shell was sent to where he was, he then made his way down to where the yokai was.

"Hey. Hey..! Easy, don't move around too much or you'll make it worse." Donnie said, he cautiously approached as the snake yokai looked over at the soft shell, a bit frightened but they calmed down.

"Listen, I'm going to help free you. I know you must be terrified and don't trust me, but I'm here to help." Donnie said.

"O..Okay.." The snake yokai calmed down and soon the Spider Shell came in through the skylight and Donnie removed his Flight Shell, putting the Spider Shell on as two pairs of mechanical arms came from the shell, the top pair of arms got a hold of the crate as Donnie made sure to have a steady grip on the crate as well. "Okay, on three I'll lift the crate and you slide out as fast as you can. Got it?" Donnie asked, earning a nod from the snake yokai.

"Okay. One, two, three!" Donnie lifted the crate with the best of his ability as the mechanical arms of the Spider Shell lifted the crate, making it move off of the snake yokai's tail, allowing the snake yokai to slither out safely. Donnie dropped the crate once the yokai was out, he gave the yokai some space as the snake yokai rubbed the bruised part of their tail.

"You're from the Hidden City, right?" Donnie asked.

The snake yokai nodded and soon shifted their form to look like Cassandra again only they had a few key differences, having more fluffy looking ears, their miscolored eyes more visible as well as cute splotches on their cheeks. "What's your name? I don't believe I've seen a yokai being able to transform like that before." Donnie remarked.

"I-I.. I'm Kimani.. you must be one of those turtles I keep hearing about." Kimani said, they pulled their knees to their chest as they did seem a bit interested in Donnie but understood if the soft shell was a bit defensive. Donnie gave a soft nod and he then sat down on the floor with Kimani.

"So, care to explain why you've taken form of the most annoying enemy me and my brothers have to deal with?" Donnie asked, arching a painted brow in confusion which made Kimani flinch, he tried to avoid hurting the snake yokai's feelings since he wasn't too good in that department, Mikey was better at emotions than him.

"I'm sorry if this form scares you, I'm just trying to find a place to belong.. I just needed to get out of the Hidden City." Kimani sighed and wiped a few tears that pricked at their eyes as they tried to ignore the memories before they explained to Donnie that they were a unique yokai having the ability to shapeshift without the use of a cloaking broach.

"Well that is pretty interesting to know, you can change your appearance without using a cloaking broach.. but, what do you mean by escaping the hidden city?" Donnie asked, a bit hesitant as he noticed Kimani starting to tear up as he flinched.

'Oh crud.. feelings!' Donnie thought.

"I am so sorry if upset you, I didn't mean to bring up an-"

"N-No, it's alright.. but, you should know at the very least. In simple terms.. I'm not technically supposed to exist, my species went extinct years ago but only about a handful of me and my friends were brought back by Baron Draxum." Kimani started.

Donnie was slightly shocked but he had a feeling that Draxum was the cause of this, knowing that the sheepman would go great lengths to create the perfect warriors but he focused on the story as he tried to understand why Kimani left.

"He subjected us to horrible experiments, one of the advantages of my kind are being able to drain Mystic Energy.. he tried to find out how we were able to do so. Some of us escaped but, I knew that it was only a matter of time before we were captured again so I remained in the shadows of the hidden city. That's when I saw you and your human friend, I realized that there may have been a way out of this terrifying life.." Kimani said, saying that they used the doorway to access the surface world and they shapeshifted into their human form to hide, hiding among the humans was definitely an adjustment for Kimani at the time.

"So, let me see if I have this correctly. You've been running nonstop for who knows how long to avoid being captured by Draxum?" Donnie asked.

"Yeah, I've tried finding different places to hide but, each spot is almost found immediately. I don't have anywhere else to go." Kimani said, they looked at Donnie with their miscolored eyes for a moment before they looked down at the floor.

Donnie glanced away for a moment and he felt something he probably shouldn't have felt in a long time, it was pity. Apart of his mind was telling him something not to do but he groaned quietly.

'Raph is not gonna hear the end about this. But what other choice do I have? I can't just leave them out here to perish like this.' Donnie thought.

"Look, Kimani." Donnie started, making Kimani look over at the soft shell with curiosity in their different colored eyes as Donnie turned to look at the snake yokai for a moment.

"I'll allow you to come and stay with me and my brothers, but don't tell them I've gone soft. They'll never hear the end of it. Understood?" Donnie asked.

After hearing this, it made Kimani giggle as Donnie felt his cheeks heating up out of embarrassment but he saw Kimani smile. "Got it, cross my heart." Kimani made an 'X' mark over their chest where their heart was and they got up as Donnie did as well.

The two then made their way back to the lair as Donnie casted a silent glance at Kimani, feeling oddly at ease with them and he had a feeling that Kimani would be just more than a roommate/friend around the lair.