giants are enormous, averaging over 16 feet in height up to 64 feet at tallest usually, and weighing around 2 tons - 16 tons.  Your categorized size is Huge or colossal.

Due to your exceptionally huge size, you take up to nine squares. And fill an area of 15 ft by 15 ft.

In some cases, you may have to squeeze into or through an area that isn’t as wide as the space you take up. You can squeeze through or into a space that is at least half as wide as your normal space. Each move into or through a narrow space count as if it were 2 squares, and while squeezed in a narrow space you take a –4 penalty on attack rolls and a –4 penalty to AC.

With your huge build you naturally gain a natural reach of 10 feet, being able to reach targets even if they aren't in adjacent squares. 

Being larger than average results in a -4-stealth modifier on checks. 

As your considered huge you can access to grappling creatures or humans categorized Gargantuan with disadvantage, and creatures of large size have disadvantage when grappling you. And creatures of small size/medium cannot grapple you. 

Giants age much slower than most races, reaching adulthood at around age 20. They tend to live much longer than most as well, usually living to be no older than a few hundred years and reaching the peak of physical and mental maturity around 80-100 years old. 

Your Strength score increases by 2 (and your maximum by 2, to a total of 22), your Constitution score increases by 1, and your Intelligence, Wisdom, are both reduced by 2.

Half-giants can switch attitudes very quickly, taking on new values to fit new situations. A half-giant whose peaceful farming life is disrupted by marauders may soon adopt the morals of the renegades who sacked his village. A half-giant’s nature is to switch his alignment aspect to imitate or otherwise react to a significant change around him.

Your base walking speed is 40 feet. And your swimming speed is 30 feet.

Half-giants find using implements made for regular folk unwieldy.  A half-giant trying to use a tool or weapon made for a medium size creature rolls the appropriate ability check or attack at disadvantage.  Similarly, a half-giant can not wear armor or clothing made for medium sized creatures at all.

Armor, clothing and weapons can be crafted to fit half-giants, the cost is four times the equivalent made for medium sized creatures, and it weighs twice as much.

You have two creature types: humanoid and giant. You can be affected by a game effect if it works on either of your creature types.

While in a good mood, particularly when laughing, the giants gain a +2 CHA bonus.