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While waiting for the anime, you can also click on the link below to read the classic original work of " Full-time Expert "!
The praying mantis in Water Margins Q was not a mythical beast but an ordinary pet. In novels, divine beasts usually referred to pets with extraordinary abilities, mysterious powers, or special characteristics, such as dragons, phoenixes, and qilins. Although the mantis was an insect, it did not have the legendary special abilities or mysterious characteristics, so it was not a divine beast.
Peter Quill and Mantis aren't siblings in the comic world. There's no established connection of that kind. They have their own unique roles and arcs that don't involve being related by blood.