The Krontep were physically identical to humans, however Yrcanos appeared to have abnormally-styled eyebrows. Whether this was part of his biology or he augmented them to appear that way, as well as if other Krontep shared these eyebrows, is unknown. (TV: Mindwarp)
The Krontep had a culture of honour based around war. Krontep were raised to believe in the glory of battle and were taught not to fear death, but rather welcome and strive to obtain a heroic one. The Krontep were ruled by a warrior king and his queen.
The Krontep believed in reincarnation based around the heroism of their deaths. They worshipped a pantheon of gods believed to be settled in Verduna, a place they would reach at the end of the cycle of reincarnation. (TV: Mindwarp)
In 2379, Warrior King Yrcanos and his assistant Dorf were captured by the Mentors and experimented upon. When Yrcanos returned to Krontep, he took the human Peri Brown back with him as his queen. (TV: Mindwarp)