Riddle

Species of cave dwelling crablike guys circling a dead sun. Abrasive and bad to have around for any delicate social matter.

Chases fun, danger, excitement. Uninterested in other people unless they pose a challenge or other sort of stimuli. Incredibly unlike others of their species which are neurotic cheetahs that are failing to propagate fast enough.

On a biological level is adapted to isolation. Eyesight problems corrected with ocular implants.