Earthlings

Earthlings (地球人 Chikyūjin) are the inhabitants of planet Earth. The term is used inclusively to refer to all of the intelligent races native to the planet, including humans, anthropomorphs, and monsters. Earthlings are typically among the weakest races in the Dragon Ball universe, with the average human's power level reading only in the single or double digits.

Overview
"Earthling" is sometimes used synonymously with "human," but the planet is actually host to many sapient lifeforms, including anthropomorphic animals. Indeed, Earthlings are led by an anthropomorphic dog named King Furry. There are 3 types of Earthlings.

Human-Type Earthling
Human-Type Earthlings are the most common type of Earthling to appear in the series. Statistically, 75% of Earthlings are standard human-type (Homo sapiens)

Animal-Type Earthling
Animal-Type Earthlings, also known as "Beastmen", are the second most common type of Earthling to appear in the series. Statistically, 17% of Earthlings are animal-type. Animal-type Earthlings come in numerous varieties, for example: anthropomorphic dogs. Sly being an example as he is a anthropomorphic cat.

Monster-Type Earthling
Monster-type Earthlings are the least common of the three primary Earthling types. Statistically, 7% of Earthlings are monster-type.

Physiology
With the exception of some uncommon hair colors (e.g. blue, pink, green, and a few others) and occasionally odd features (ranging from longer lifespans to werewolf-ism), Dragon Ball humans are identical to their real-life counterparts.

Power
When compared to other races of Dragon Ball, the average Earthling is significantly weaker. It is said that a single Saiyan infant would be capable of destroying the average human population on its own. The power level for a "normal" human is 5. But of course power levels for humans vary as they can reach double digits.

At the peak power to which a human-type Earthling can get without possessing ki manipulation or special powers, they can perform feats like destroying walls with physical blows, leaping great heights, moving fast enough to appear invisible to an ordinary human, and, in the anime, even pulling buses and punching through metal.

Earthlings make up for their lack of physical strength by using weapons and technology. Various characters have at times employed firearms (e.g. guns), explosives (like bazookas and grenades), mechanized weaponry, and robotic suits as means of fighting. While these weapons can be deadly to the average Earthling, they are largely or completely ineffective against super-humans, androids, and many extraterrestrial races.

Organized Forces
The Earthlings have a large military that has appeared at various times throughout the series. It consists of ground troops, tanks, fighter jets, and large naval ships. It also appears that the Earth is united into one global monarchy.

Energy Manipulation
Earthlings' capacity for energy manipulation is widely variable. They can have anywhere from a basic to advanced grasp of ki-based powers, depending on innate talent, intensity and duration of training and experience.

With enough physical power and proper ki training, Earthlings are able to generate very powerful energy blasts, enough to easily cause big explosions, or, when going absolute full-power, even destroy an astronomical object the size of Earth's moon.

However, if a person with no proper physical or ki training attempts to do a ki-based attack, the energy produced will dissipate within seconds.

Magic
Some Earthlings such are shown to be capable of using Magic, magical techniques, or mystical items.

Lifespan
While the average lifespan of regular human beings seems to be largely equal to that of their real-life counterparts (75 to 90 years, with longer, natural exceptions), there are a handful of humans who have lived well over 150 years, and are still functionally healthy.

Reproduction
Human-type Earthlings are a sexually dimorphic race. They reproduce sexually, with a full-term pregnancy lasting roughly nine months.

The mating habits of non-human-type Earthlings are not known. Presumably, they conform to the types of reproduction common to their class or kind.

Hybridization
Humans and Saiyans are able to produce fertile offspring. These so-called "Half-Saiyans" include Shoten Cole, and Greif Tsuki

Hidden Potential
Earthlings can have their hidden potential unlocked to use their full potential at the time it was released. As a result, their power level increases and produce a white aura when powering up.

Kaioken
Earthlings are shown to be capable of using the Kaio-ken and its x3, x4, and x20 multipliers to power-up. When using the technique, an Earthlings' ki is multiplied for a heart beat thus increasing their speed and power level. Though the power-up comes with the downside of taking a toll on the user's body and could potential kill them if they multiply their base ki too much as it could either obliterate them or severely injure them. With the exception of Sly when he was taught how to make the energy flow naturally so he can remain powered up longer periods of time without having to worry about his body exploding so much.