Two of a Kind
Dooku and Qui-Gon: Choosing a Padawan, as far as Dooku was concerned, wasn't an easy process. It involved watching the initiates closely to figure out which of them had the strongest potential and which one was most likely to achieve great success as a Jedi, thereby enhancing their Master's prestige among the Jedi. In the end, after he had seen Qui-Gon Jinn win the student lightsaber tournament, he had chosen Qui-Gon, because the boy's strength, grace, and overall strategy were all most impressive. Indeed, if pressed, Dooku would have admitted that something in the way Qui-Gon carried himself reminded Dooku of himself. In short, then, Dooku, had selected Qui-Gon, because they were two of a kind, and over the years, when Qui-Gon's unconventionality and fierce independence reared their ugly heads, he would remind himself of that.
Qui-Gon and Obi-Wan: On the surface, Qui-Gon knew that he and Obi-Wan could hardly have appeared more different. He was comfortable with the Living Force, while Obi-Wan preferred the Unifying Force. Qui-Gon was unconventional; his apprentice a traditionalist. Qui-Gon was willing to bend or break the rules when he deemed it necessary, whereas Obi-Wan tended to go out of his way to follow them. Qui-Gon was intuitive, and Obi-Wan logical. Yet, on the inside, where character was really determined, Qui-Gon thought that they were the same. Both of them had a strong sense of right and wrong. Both of them wanted to do nothing more with their lives than serve others. Both of them had a stubborn streak three kilometers wide that allowed them to fight steadily on long after everyone else would have surrendered. They even had similar dry senses of humor. Yes, they were really two of a kind, and that was what made their relationship so wonderful.
Obi-Wan and Anakin: Most of the time, Obi-Wan didn't think of the similarities between him and Anakin. After all, the differences between them were far more striking. One would have to be blind to miss the contrast between Anakin's carefree nature and Obi-Wan's more serious one. Nobody could not spot the difference between Anakin's impetuosity and Obi-Wan's caution. The similarities were far easier to miss, since they were buried inside. Even Obi-Wan was prone to forgetting the similarities, but he could never forget the biggest one—that the engine that fueled both of them was nothing more than a determination not to fail. At heart, they really were two of a kind: nothing more than two galactic heroes who knew that no matter what they did, it would never be quite good enough.
Anakin and Ahsoka: As far as Anakin was concerned, having a Padawan was greatly overrated among the Jedi. There were times when Ahsoka did something particularly impulsive or said something particularly impertinent when he found himself wondering if the Council had foisted her on him just to drive him into committing suicide. In the next instant, he would know that they had assigned her to him because she was as scrappy, headstrong, and temperamental as he had been as an apprentice. Whenever he was confronted by her raised chin in an argument and had to squash the urge to strangle her, he would remind himself that he was only so aggravated with her because they were two of a kind, and that if he had turned out fine, she would, too.