
Spoiler:
Master Shifu is a grey coated Red Panda who was Oogway's student and the trainer and master of Po and the Furious Five, as well as Tai Lung. In the TV show, it is revealed that Master Shifu has a father, an incorrigible confidence artist who used him as a shillwhen he was a child. Eventually, Shifu's father left him at the Jade Palace, a deed that emotionally scarred Shifu for years, and Master Oogway took custody of the abandoned cub and trained him in the martial arts. It was discovered that he was once a member of the original Furious Five in the TV series nicknamed Sea food.In the first movie, Shifu is quite often shown to be angered, frustrated, despairing or worried, at first for unknown reason. However, it is later revealed that the main antagonist, Tai Lung, is Shifu's adoptive son, who he trained, loved and raised as if he were his own. As Tigress says, "Shifu loved Tai Lung like he had never loved anyone before. Or since." This extends to Po who was dubbed the Dragon Warrior against all logic from Shifu's point of view. Shifu's initial hostility to the giant panda fades upon learning his considerable latent talent for the martial arts. After Tai Lung's defeat, Shifu gains inner peace, knowing that the valley is safe from Tai Lung's bitterness about being refused the dragon scroll.
In the second movie, Shifu is now much more relaxed and is therefore a much better master to Po and The Five than he used to be. However, he loses inner peace after Po is seemingly killed by one of Lord Shen's cannons. He does not regain inner peace until after Shen is defeated.
He has a strict sensible personality that makes Po consider him too uptight, but he is kind and warm spirited. He is shown to be good with children, having adopted two, Tai Lung and Tigress. However, Shifu's care was flawed considering Tai Lung grew to become an arrogant warrior under his instruction who went on a destructive rampage when Oogway denied him the status of Dragon Warrior, and Tigress felt too often unloved by her embittered adopted father who wanted to prevent her from sharing Tai Lung's fate. He also has a large mouth, shown to be able to hold about ten dumplings. Shifu knows the nerve strike, although he is never shown to use it, and he also knows how to heal the aftermath of a nerve strike.
In Kung Fu Panda: Legends of Awesomeness, Shifu is the Master of the Jade Palace while training Po and the Furious Five. It is revealed that he has several old rivals who are villains throughout the series. He also has a father named Shirong. In "Croc You Like a Hurricane," Master Shifu posed as Master Jia in order to train the Croc Bandits and later the Furious Five in order to get Po to see what it means to be trained.
His name is redundant as Shifu means master in Mandarin.
In the second movie, Shifu is now much more relaxed and is therefore a much better master to Po and The Five than he used to be. However, he loses inner peace after Po is seemingly killed by one of Lord Shen's cannons. He does not regain inner peace until after Shen is defeated.
He has a strict sensible personality that makes Po consider him too uptight, but he is kind and warm spirited. He is shown to be good with children, having adopted two, Tai Lung and Tigress. However, Shifu's care was flawed considering Tai Lung grew to become an arrogant warrior under his instruction who went on a destructive rampage when Oogway denied him the status of Dragon Warrior, and Tigress felt too often unloved by her embittered adopted father who wanted to prevent her from sharing Tai Lung's fate. He also has a large mouth, shown to be able to hold about ten dumplings. Shifu knows the nerve strike, although he is never shown to use it, and he also knows how to heal the aftermath of a nerve strike.
In Kung Fu Panda: Legends of Awesomeness, Shifu is the Master of the Jade Palace while training Po and the Furious Five. It is revealed that he has several old rivals who are villains throughout the series. He also has a father named Shirong. In "Croc You Like a Hurricane," Master Shifu posed as Master Jia in order to train the Croc Bandits and later the Furious Five in order to get Po to see what it means to be trained.
His name is redundant as Shifu means master in Mandarin.

Spoiler:
In the 2012 series, Splinter was originally a human named Hamato Yoshi and resided in Japan where he became an expert of ninjutsu. When his friend Oroku Saki sought the affections of Splinter's wife Tang Shen, Saki wished to discredit Yoshi in front of her. Yoshi lost his temper and the altercation ended their friendship culminating in a battle that burned down Yoshi's home killing Shen and seemingly their daughter Miwa. After moving to New York City, Yoshi had just purchased four pet turtles when he stumbled upon an exchange in an alley between two Kraang droids. Seeking to silence Yoshi before he could share what he had seen, a fight ensued and the canister the droids had been carrying smashed open splashing both Yoshi and his turtles with an alien chemical called mutagen. As the result, Yoshi changed into a humanoid rat after having had contact with a rat upon entering an alley, while the Turtles took on human characteristics. Realizing he could no longer live a normal life topside, he retreated to the New York sewers where he raised his pets as sons and taught them the ancient Japanese fighting art of ninjutsu.
Splinter's sons-along with their new friend April O'Neil-soon became involved in the conflict with both of Splinter's old enemies, the Shredder and the Kraang. Reluctantly allowing the group to get involved in these battles, Splinter appointed Leonardo as their leader and continued to offer counsel and lessons as they engaged various foes. Recognizing great sensitivity in April, he began training her as a kunoichi, and came to regard her with a fatherly fondness. He briefly became determined that the Turtles would not travel above the surface until they were ready to fight the Shredder, but eventually realized that he was only making them more fearful of his old rival. Splinter rarely ventured from the lair, and did so on only two notable occasions. The first was when he fell under the control of the Rat King, who attempted to persuade him to forsake his humanity and embrace the life of a rat, but whom Splinter eventually broke free from with the Turtles' help and defeated. The second was when Shredder kidnapped April with the Kraang's help and lured Splinter to his stronghold for a final confrontation. Splinter overpowered Shredder's men and engaged his old foe, whom he attempted to reason with by claiming that once he destroyed Splinter he would have nothing left. An amused Shredder then revealed that as Splinter had once "stolen" Tang Shen from him, Shredder had stolen something from him: his infant daughter Miwa, whom the Shredder had since raised as his own. Splinter nearly defeated Shredder, only to be attacked by Miwa, whom Shredder had named Karai and convinced that Splinter was behind her mother's death.
Splinter's sons-along with their new friend April O'Neil-soon became involved in the conflict with both of Splinter's old enemies, the Shredder and the Kraang. Reluctantly allowing the group to get involved in these battles, Splinter appointed Leonardo as their leader and continued to offer counsel and lessons as they engaged various foes. Recognizing great sensitivity in April, he began training her as a kunoichi, and came to regard her with a fatherly fondness. He briefly became determined that the Turtles would not travel above the surface until they were ready to fight the Shredder, but eventually realized that he was only making them more fearful of his old rival. Splinter rarely ventured from the lair, and did so on only two notable occasions. The first was when he fell under the control of the Rat King, who attempted to persuade him to forsake his humanity and embrace the life of a rat, but whom Splinter eventually broke free from with the Turtles' help and defeated. The second was when Shredder kidnapped April with the Kraang's help and lured Splinter to his stronghold for a final confrontation. Splinter overpowered Shredder's men and engaged his old foe, whom he attempted to reason with by claiming that once he destroyed Splinter he would have nothing left. An amused Shredder then revealed that as Splinter had once "stolen" Tang Shen from him, Shredder had stolen something from him: his infant daughter Miwa, whom the Shredder had since raised as his own. Splinter nearly defeated Shredder, only to be attacked by Miwa, whom Shredder had named Karai and convinced that Splinter was behind her mother's death.