Slave

A slave  is someone who is treated as property and forced to work. Slaves are often held against their will, and can be bought and sold across Districts.

Practice of slavery
Slavery is considered legal across the Barsburg Empire, with the slave trade being a highly profitable business. Both males and females can be sold into slavery. It is most common amongst the nobility of any District, who use slaves of different species- such as Trolls and Noel Mermaids. as well as humans, as trophies and pets.

In the series, slaves are used for a number of purposes, including domestic work, as pets and the most common form being battle slaves and child soldiers, who are used to fight. Slaves are required to wear chains until they are bought.

Slave traders
Slave traders are highly respected by the Barsburg Armed Forces, and are usually able to travel throughout the Districts without inspection or identification papers for their slaves.

Many of them are very wealthy.

Slaves
The rarer the features a slave possesses (eye colour, hair colour, beauty etc.) the higher the price the slave will fetch. Some slaves can cost up to 50 million yuus (Barsburg currency).

It appears that the slaves that resemble nobility the most (e.g. fair skin, blonde hair, and light green eyes) are the most expensive. Disguising a slave's appearance (via hair dye or other similar cosmetics) to increase the slave's price is illegal.

Identification
Slaves are marked with a slave brand on their lower back. The scar left from it will last for life and is used to mark them as 'less than human'. It can also be used to identify a slave that has escaped.

The process of marking a slave with a slave brand is very painful for the slave.

Characters who have been slaves
Slavery is a recurring, prominent theme throughout the series and as such, some of the characters' pasts are centered on slavery. Teito Klein and Capella are just two examples of slaves in 07-Ghost.

Treatment
Slaves, particularly battle slaves, are treated brutally. Throughout the Barsburg Empire it is legal to beat slaves unconscious- even with weapons, and deprive them of food. It is not considered a crime or a loss to kill a slave because they are at the bottom of the social hierarchy.

Battle slaves are trained from a young age to kill the military use them as a human weapon. Their reactions are tested by having to destroy a group of fast-moving orbs, and 'real combat' training is fighting and killing condemned prisoners. Their Zaiphon is also tested. They are given a four-digit number as opposed to a name.

They normally wear a dark, tight jumpsuit, and no armour. They also wear Restraints, and a metal 'strap' across their chest where a leash can be attached.

The Imperial Army uses them to execute prisoners, and the Barsburg royal family forces them to fight each other in coliseums, or collects their body parts.

Un-bought slaves are prevented from entering privately owned buildings. This is because they would 'bother the other customers'. They can be identified by the chains around their wrists that can only freed by bought them.

Payment
They are paid by treatment, and do not receive any money (Teito did not know what yuus are when he first saw Frau using the currency while they were in Ria).

History
Although slaves may have been common before the fall of the Raggs Kingdom, after the Raggs War, there was a huge surge in slave numbers as many of those not killed during the war were enslaved by Barsburg. As of the last manga chapter, a comment made by Carl seems to indicate that after the two-year timeskip, slavery in the Empire is on the wane.