The Grallt are the aliens that encountered Earth by a navigational mistake. They are quite humanoid in appearance and behavior, but there some differences:
The Enkheil are the first aliens that humans encountered after leaving Earth. Their home planet is Keelisika. As all of the Kree the Enkheil are humanoids, generally taller than humans and with Pug - like faces. All modern Enkheil have wings, but are unable to fly due to their weight.
The Enkheil have their own history of bloody wars and over time have solved the problem by creating military units of different types regularly engaging each other in mock combat. One of the famous airborne units are the Combat Dancers who engaged SPADET-1 twice and lost both times. Khrog Dhakgo and his mate Ghnal Dhango are the leaders of the Combat Dancers
The Enkheil have stories about "Mud People" - species native to Keelisika sharing the same appearance as humans. The Mud People live as nomads, possess advanced technology and are always willing to help strangers, but never give any explanations.
"The Draculas", the Bur are extremely war-like.