If you don't mind, I could always write a bit ol lore for my oni's at least.
The green onis, also known as orcs, often have physical features similar to boars. Tusks, fur, snouts, and large amounts of fat that hide their immense physical strength. They have a bad history of rape and violence, often making them the pariahs of magical creatures, more hated than even demons. There's no denying that such things have happened, but there are more to these green oni's than just what the stories would tell. The orcs were skilled craftsmen of the mountains, with a nose for metal and gems. Their crafts were well known for their sturdy composition and effectiveness despite sub-par materials. Where some legends tell of heroes who use weapons of god-given materials, orcish heroes make due with mortal iron, with the best heroes making their own equipment with materials gathered themselves. The orcs have built their community with family honor but also an unspoken rule. And that rule was that no crime against a family, not matter how minor, will go unpunished. While the severity of the judgement varies, there was no doubt that any slight was accounted for. This rule was carried in all orcs, making them hesitant to go to war with one another as their honor demanded that their family be protected, not dragged into genocide. While peace and cooperation was still rare due to internal hostilities, the orcs knew that if they expected to survive their world, they would need to work together.
Of course their cooperation did not mean things ever went well. Not for anyone who wasn't an orc; orcs who found alliances with each other often then directed their combined might onto others, dwarves and elves in particular. They always had competed for common resources, but orcs had the advantage of stronger bodies and greater numbers, typically to off set their shorter lives and lack of development. Thus orcs were in a perpetual state of conflict with other races until humans came into power. While and individual orc was still stronger than a single human, they could match the orcs numbers but combine it with the intelligence of elves and the craftsmanship of dwarves, forcing the orcs back. With the arrival of humans the orcs were forced to reevaluate their lifestyles, knowing that continued warfare will only result in all their deaths.
The orcs were divided. Many loyal to their old code demanded that the orcs gather their people together and wipe out their enemies in one go. An equally large side, more concerned about the lives of their people, wanted to coexist with the other races, seeing no point in perpetuating senseless violence for honor which will only get them and those they love killed. A small civil war disrupted, but ultimately the two sides left each other.
The orcs who intermingled with humans have largely saturated into humans, losing many of their more orcish traits such as snouts and tusks. Many of these orcs have gone through so many generations among humans that they are hardly orcs in appearance or temperament, causing them to vanish as a distinctive race. The isolationist orcs, seeing that their heritage could be lost if they intermingled with humans, became even more isolated, with only a few families or individuals to ever leave their hidden homes to explore the world around them. Despite orcs inevitably losing their monstrous traits as generations went by, they gained a new sense of humanity that allowed them to do greater things.
And that's more or less a rough draft of who the orcs are and what they're up to.