"Szayel! I believe we have done it!" the painted scientist exclaimed to the other. The pink haired Arrancar walked over to the mostly covered body of a woman about in her late teens. "So, the growth serum worked on her?"
"Yes, this morning she looked like a child, and now she's like this!" Mayuri exclaimed in glee.
"I'm still not sure how you were able to obtain the sample DNA from her 'parents'."
The Shinigami Capitan just laughed and shook him off. "Those two? Yoruichi was certainly difficult, but Ichigo is such a heavy sleeper that it was easy."
He started disconnecting the IV from the woman's arm and noticed something odd. It seemed like reiatsu was trickling from her, and as he went to find the source, the reiatsu exploded in a blinding flash of light and heat. Once the reiatsu settled, he looked to see the girl he and Szayel created crouched on the table. He looked closer and saw a hollow mask that looked like a cat's face, in one hand, and a bright red zanpakutou in the other.
The girl put the hollow mask on the side of her head and it disappeared. She then leapt from the table, landing like a cat, one hand on the ground, before standing at her full height and walking over to the two scientists. As she came closer, the men couldn't help but stare. They knew she had grown up because of the serum, but she was built almost like her "mother" Yoruichi. As she got closer, the girl started scowling, confused as to what they were staring at. She followed their eyes, and hers became wide in realization. She dropped down in a ball to hide her body and pointed her zanpakutou right at the two men.
"Clothes, now. Don't dawdle, or I'll release Hiryuu from her shell." At the mention of her name, the zanpakutou shone and seemed to subtly catch fire near the flame formed hand guard.
The two men scrambled up and went to fetch her some clothes. They brought back a few outfits, and she decided to choose the blood-red colored get up. She then glared at them to leave, they did so, and she got dressed.

"It seems our little flower has certainly grown up, Szayel. Perhaps it is time to give her the rest of her name?"
"Mayuri, I have a feeling that she was born with her name. Didn't you notice that her eyes did not change color once she put the hollow mask on?"
Mayuri nodded and waited until they were called back into the lab.

After getting dressed, the girl looked around the lab and took a good few deep breaths. Last thing she remembered was going to sleep last night as a little girl, and now she was a full grown woman. Needless to say, she was a bit confused, and yet, she was happy. In her small body, she didn't feel like she fit. Like there was too much of her to stay within her spirit body's skin. Now, she felt like she could handle that aching power that longed to be free.
She walked around a little bit to make sure she was used to her new height before going over to where the two men had disappeared to. Sticking her head around the corner, her long pinkish-purple hair draped down. She saw the two men's backs and decided to have a little fun. Faster than a blink, she ran up, tapped their shoulders and then ran back to the doorway before they could even turn to see, in the opposite directions, who had tapped them on the shoulder.
Seeing no one there, the two men realized who it was and laughed before heading back to the lab. The girl was seated in one of the chairs that swung back and forth, head in her hands, trying to look as innocent to the trick as possible.
"We know you did that, little flower. There's no use in hiding it," Szayel said and chuckled at the girl's smirk. The scientists decided that she looked very much like Ichigo when she smirked or scowled.
"Now, my dear, what might be your name?" Mayuri asked with a soft smile.
"Kohana. Kohana Gaidoku," she said with a smile.