Giants are a species of magical beings. They are known for their towering heights (the smallest giants are more than 16 feet tall) and for their violent nature. Full giants have largely gone extinct as clan fighting has claimed many lives.
Part Giants
Half giant, Rubeus Hagrid
Part giants are tanks, with heightened strength and resistance to magic, but also have a difficult time learning how to use magic.
On Alohomora part Giants can be half, quarter, and eighth.
GENERAL APPEARANCE
Half giants are known for their unusual size and height. They naturally will be quite a bit taller, and larger, than their pure human counterparts. They are typically between the height of 7-9 feet in height, a rare few exceeding that height on occasion. (We are going off of the movies' depiction of half giants. Hagrid in the movies was under 9 feet in height.) Even when their giant blood is diluted past 1/8th, they can still maintain heights above 6 feet.
They are large in nature and almost always above average weight. Much of their mass is muscle.
While not always, they can inherit black eyes from their giant parent, grandparent, etc.
AGING AND PHYSICAL ABILITIES
Part-giants age at the same rate as witches and wizards, which means a natural lifespan of at least 150 years due to their magical nature. Part-giants do not lose muscle definition as they grow older, however, and this combined with their natural resistance to sickness means they will often be in superb health and physical condition compared to a wizard of the same age.
Part-giants have above average physical strength, and resilience. They can typically lift 3-4 times that of an average human (this is depicted as more in the books and movies but this has been watered down for our use). And simply do to their size it can be harder to inflict enough damage to bring one down. They do have surprisingly quick reflexes (their giant relatives being known to catch birds from the sky.).
Part-giants can survive entirely on meat from their giant heritage, but through their human heritage they can also eat fruits and vegetables. However, all part-giants down to one-eighth must have meat in their diet. Beyond one-eighth, part-giants are physically human.
Part-giants naturally recover quicker from injuries. They can regrow their teeth, should one be damaged in some way. Their healing ability is equivalent to twice that of a pure human (it will only take them 3-4 weeks to heal a broken bone while a pure human would take 6-8 weeks.)
WEAKNESSES
The magical resilience of part-giants cuts both ways. Part-giants will naturally fight off the few curses that affect them over a period of time, and their bodies have a tendency to recover at a faster natural rate than humans. But they also cannot use magical means to recover themselves. Healing spells and potions do not have any affect on them unless extremely potent.
They also will have a natural disadvantage to learning magic. Since they are so naturally resistant to magic it will take them twice as long, if not more time, to learn new spells. The most complicated of spells can even be completely out of their ability to use entirely. Nor will they be able to use transfiguration magic on themselves to any degree (even to change their eyebrow color).
Part-giants are known to still have their giant relatives temper. Naturally they have a violent temper, though they can learn how to control this. Due to their incredible strength as well, they are typically unable to do tasks that require delicate work.
SOCIETAL STATUS
Part-giants are a rare occurrence so it can, at times, be difficult for people to recognize one. So they can, at times, be known to fly under the radar. When they are recognized for what they are they are treated much like other demihumans. Which is; it depends on who they talk to. Some people will immediately accept someone for not being full human without a fuss while others will find them unnatural and dangerous. Many people can, and will, try to stir up problems for part-giants because they believe that part-giants are just as wild as their giant relatives and don't deserve a place in the Wizarding society.
Because of their physical capabilities they have been banned from competing in all magical sports (like Quidditch) at a professional level. They can also have some difficulty getting into the Aurors program because they have immense difficulty passing some of the tests.