Before, the Cotati possessed a semi-humanoid, semi-plantlike appearance. Because of their transformation, they were rendered immobile.
Hundred millenia ago, the Skrulls (at that time a benevolent race) wandered the universe, searching for species they could help to evolve. Discovering two separate species on Hala, they held a contest to determine the worthier race. Their task was to create a habitable area on Earth’s moon. The Kree built a huge city, including artificial gravity and self-replenishing air, to resemble Earth’s circumstances as much as possible. This habitat will be known as the Blue Area of the moon.
The Cotati on the other hand developed an enclosed ecological system for the area, which was mandatory for its habitation. Therefore it was them who were considered as winners of the contest. Enraged by this declaration of inferiority, the Kree killed the Skrull ambassador and his crew, seized their starship and made its technology their own. Now they were equipped to fight what will be known as the eon-long war between Kree and Skrull.
But the Kree didn´t concentrate solely on the Skrull. Their humiliation led them to diminish the entire Cotati population. But they were able to spawn a new generation before dying. From now on they let their body devolve into normal looking plants in order to hide from the Kree, while perfecting their mental powers. But they revealed themselves to a peaceful sect consisting of Kree called the Priests of Pama. They cared for the Cotati, which in return teached the secrets of the mind to their new allies.
Upon the priests exile, they took the Cotati with them to inhabit every living world they would encounter, among them Earth and the planet Tamal, what would become the new home for the plant-species. The greatest impact they had on Earth was the fulfillment of a prophecy. A prophecy that foresaw the union of the perfect human with the perfect plant, the result of that being the perfect child, the Celestial Messiah. The perfect human was the Celestial Madonna named Mantis, while the perfect plant was the Elder Cotati, who inhabited the dead body of Swordsman. They held a double-marriage together with Vision and the Scarlet Witch, which was officiated by Immortus. The child (Sequioa or Quoi) was first raised on Earth and later on went to Tamal with his father.
Some time later, the High Cotati, the council of the Cotati, decided that Quoi should only be raised by them. This led to fight with them, the Priests of Pama and Kang on the one side, Mantis, who tried to reclaim her son, Silver Surfer and the Fantastic Four on the other. When the Cotati realized, that they couldn’t win this fight, they fled , taking Quoi with them.Accompanied by the Avengers, Mantis found her son on Tamal, who needed protection from Thanos. Obviously, most of the Cotati, including the Elder Cotati, didn’t share their council’s opinion, since they came to welcome the newcomers. But upon failing to protect the Celestial Messiah, the Cotati attacked the Avengers, who barely managed to escape.