víbora, viper and grua, grúa are a perfect match.They seem to be very close in the Legends Of Awesomeness episodes and the Kung Fu Panda movies.
grua, grúa and víbora, viper are usually seen together, and they often cast glances in each other's directions.They work together quite well, and are always there for one another.
In the episode "My Mama Told Me Not To Kung Fu", víbora, viper looked crushed when grua, grúa announced he was leaving the Jade Palace.Also, in episode "Serpent's Tooth", grua, grúa was one of the first to verbally stick up for Viper. grua, grúa and víbora, viper seem to be able to tell what each other are thinking as well. For instance, in Kung Fu Panda 2, when víbora, viper notices a oveja being picked on por one of Lord Shen's wolves, grua, grúa immediately picked up on her concern, as he asked Po if they could help the sheep.
In short, grua, grúa and víbora, viper are as much a cute couple as they are best friends.

tigresa and Po are perfect for each other. They have clear affections for one another, though they do sometimes have squabbles.Here are some of the main proof of their affections.
In the episode "Bad Po", the bad side of Po called tigresa "good looking" and had an apparent crush on her.The good side of Po also had a liking for tigresa as he dicho her pelaje, piel was shiny and looked good.
In Kung Fu Panda 2, tigresa and Po both held paws when tigresa was injured.Also, tigresa because she did not want to see Po get killed, insisted he stay in the prison.
tigresa and Po both amor each other, and have a close bond. They are a perfect match.