Disclaimer: Naruto belongs to Masashi Kishimoto
Kumo stiffened when her sensei finally decided to show himself. "You were the one that forced me to be human again." She accused.
"I was. My name is Kakashi Hatake, and I will be your sensei for the time being. To give me a sense of your powers, you task will be to retrieve this bell before noon."
Kumo nodded, already formulating a plan.
Two hours in, with one hour left to go, Kakashi sighed in disappointment. He had had such hopes. But she was very predictable and showy. Her transformations were spectacular, but her clones were weak and somewhat transparent, she breathed fire, but her skills with the kunai and shuriken were pitiful, and her strategies were completely unimaginative and simple. Why did I think I might need my Sharingan? He wondered. She seemed so determined and strong when she was fighting to remain a spider. But now she's going to need a lot of work. Almost mechanically he parried her blows. "You know you only have one hour left to get the bell. If you don't, there is no guarantee that I will find you worth training."
"That's okay, I already have it." With a triumphant grin, the girl crossing kunai with Kakashi disappeared in a cloud of dust. What? Was that a shadow clone? He saw her standing at the edge of the woods, brandishing a bell. When did she get that? How did she get it?
"I gotcha!" she crowed, delighted at the puzzled expression that had replaced the confident, bored one on Kakashi's face, or at least the portion that was visible.
Kakashi checked his belt. The bell was not there. When did she get it?
"You thought I was weak and pathetic. I've been having a shadow clone play that way as a distraction for two hours until you began to let your guard down. You didn't notice me as an ant crawl up your pant leg and steal the bell." She informed him smugly.
"If that is so, would you care to show me the full extent of your powers?"
"With pleasure." She sprouted orange fur and grew, only stopping when she was a tiger who was as tall at the shoulder as the trees around them. She charged, and when Kakashi leapt aside, she turned her head and spat a huge torrent of fire while he was in the air and less able to dodge. She anticipated my jumping, and she can release jutsu while transformed. Kakashi threw a shuriken with a thread attached to it and yanked when it wrapped around a tree branch, pulling himself out of the way of the fiery torrent. I may need my Sharingan after all.
For the next hour, it was all Kakashi could do to keep up with her. She had more chakra than he had expected, and shadow clones, though she could only manage two, were formidable when combined with her transformations when she suppressed her chakra signature. It was hard to anticipate from where he would be attacked, or what he would be attacked by. He had to keep alert for everything from giant grizzly bears to ants simultaneously. Though Kakashi noticed that she never used Genjutsu, rarely used Taijutsu, and struggled a bit with Ninjutsu other than transformation. He had never heard of someone being able to keep several partial transformations going at once, but then again, when he had first met her, she was still a spider though her chakra had been drained. Her transformations seemed as natural to her breathing. He wondered whether it was due to being the prodigy of a jinchuriki, the experimentation that had been done on her, or the combination. Either one could also explain her massive chakra reservoir which had led to her "episodes."
"Very well. I think you will be worth training." He stated when she stopped for a moment, gasping for breath. "We will meet here again tomorrow morning, 4 hours before noon."
"Will you be on time tomorrow?" she asked pointedly.
"There was an old lady who needed my help to carry her groceries." Kakashi explained.
"And that took you 3 hours? I don't think so."
Kakashi just shrugged, and with a jaunty wave disappeared in a puff of smoke.