Ulhuqqa are ruthless combatants in space or ground shootouts, and will sacrifice themselves willingly if it means inflicting serious damage on any non-Ulhuqqa installations or personnel. They are completely merciless. They do not take prisoners and kill all sentients they can, as quickly and efficiently as possible. Ulhuqqa do not deliberately target non-sentient creatures, but show no qualms about incidental destruction of such life forms.
Ulhuqqa are patient and methodical in their approach to warfare. Their attacks are always well thought out and planned. They take time to consolidate their gains before launching new offensives, which partially explains why more worlds have not yet been attacked.
Ulhuqqa do not seem to have much individual personality at all. Nothing perturbs them, they are completely unfazeable, and do not seem to understand the concept of humour. When captured, they show no fear and refuse to cooperate or answer questions even under threat of torture or death. Even under obvious scrutiny, they constantly try to escape and return to report what they have learnt. They are curious, and even while captured will attempt to grab things and study them, probably in an effort to learn more about the enemy.
Although not as physically strong as humans on average, Ulhuqqa do not tire easily, and can maintain vigilance or activity for several days without rest. Ulhuqqa seem to be able to digest and gain nourishment from human food, but it is not known what they normally eat. Dissection of Ulhuqqa reveals no obvious reproductive organs. It is unknown how they reproduce.
There is some speculation amongst xenobiologists that the Ulhuqqa encountered so far represent only a subset of the entire species, perhaps a warrior caste or sexless drones. Some even go as far as saying that the Ulhuqqa are a warrior slave species, acting under the orders of a master species yet to be encountered.
The Ulhuqqa have never made any obvious attempt to rescue or bargain for prisoners. It may be that the concept of taking prisoners is alien to them, so they do not believe that any Ulhuqqa will be captured alive. Attempts to communicate that prisoners have been taken have always been ignored.
Ulhuqqa technology is mostly up to state-of-the-art standards. They do not use audio channels in radio communications. Their video channels are highly compressed and require special decoding programs to display properly. No leaked radio transmissions from stars within Ulhuqqa territory have yet been intercepted. Ulhuqqa starships are well designed and ruggedly built. Whether this is standard for their species or specialised for military use is not known.
Ulhuqqa views on religion, art, and entertainment are completely unknown. Speculation runs the full gamut of possibilities.
At present, the Ulhuqqa offensives have been restricted to a border area between human-space and the Ulhuqqa region. This border is not far from the Larrokite homeworld, and the Ulhuqqa have so far destroyed two Larrokite colonies. Nearby worlds are bracing for invasion.
Worlds near the Ulhuqqa border have been beaming radio messages requesting communication and negotiation to known Ulhuqqa worlds and likely candidate stars within Ulhuqqa territory for many years now. No response has ever been received. Other radio communications near border worlds are carefully beamed or restricted, to limit Ulhuqqa eavesdropping.
There are some unsubstantiated rumours and conspiracy theories that the Memer are allies of the Ulhuqqa. Advocates of such theories point out the similarities in communication mode and exoskeletal biology of the species, and the general xenophobia and secrecy of the Memer. The fact that Memer often undercut other merchant shipping endeavours is seen as evidence that they are trying to destabilise interstellar economy and society from within. Critics point out that, in xenobiological terms, Ulhuqqa and Memer are about as closely related as humans and Pachekki, and that known areas of Memer operations are nowhere near Ulhuqqa territory. Of course, the conspiracy theorists posit a secret alliance, pincer military action, and even covert dealings between the Ulhuqqa, Memer, and high-ranking officials of other species.