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They are a family of hybrid tuba and monsters that seem to attack people who refuse to play their tubas, and they never get enough of it.
Tubacabras are determined and very focused on their job of attacking rebels of the Tuba world, and they will never stop. They are very loyal to Vicky, a ginger babysitter who tortures Timmy Turner. They love the sound of the Tuba in the morning!
Tubacabras are part of an unknown family, and they are designed to attack kids who don't practice the tuba.
Scary God Parent
Timmy Turner- The tubacabras are enemies with Timmy, but only at times he is not playing the tuba, and they never had a friendly relationship with each other, even when Timmy is playing the tuba.
Vicky- The tubacabras have never met Vicky, but if they did, they would be allies with each other, but they could also attack Vicky for not playing the Tuba, and there is no known relationship with Vicky.
Other Kids- The tuba attacks any kid who doesn't practice the tuba, that's all...