Very aggressive and greedy species, gathering resources where they can find them. Always demanding and sometimes attacking without provocation. Some advanted tactics have been learned from other species but nothing innovative., they are not an intellectual species. Technology is heavily projectile based.
An all-female species born from agony and pain. Because they have lost their males completely, they must now hunt for males from other species to mate with. Equipped with advanced technology and known to appear in the dreams of humans.
Energy beings with a unified mind,using very advanced and coordinated tactics combined with the most advanced energy technology encountered so far.They are known to use humands as energy resources by plugging them direcly into their ships
lost home world, stolen tech from other races
beings that have been self aware since the dawn of time. Huge threat to humanity
These are not complete summaries. Feel free to add on. I will do so as well.