The Deferi play an important role in the Cold War Feature Series, where they are endangered by the Breen. They are also under threat from the Borg, with the Deferi homeworld facing direct invasion by the Collective.
 Physical features
Deferi have a range of light green skin tones. Their skull cranium is pronounced, while the nose is relatively flat for humanoid species. Females and Males differ in some regards. While Males seem to have reptilian slit eyes, Females have more humanoid looking pupils. Also, females have a very pronounces bony ridge on their foreheads, spanning from the nose bridge up to the cranium.
The Deferi hold equality in high esteem. In fact their ideology is based on the Balance, an universal value they strive for with every action they take.
In Deferi space there a lot of ruins from an ancient race called the Preservers. This humanoid species is supposed to be the origin for the abundance of humanoid species in the Milky Way. Their advanced technology is what attracts the Breen to Deferi worlds, although up to now, neither the Deferi nor anyone else has learned, how and if this knowledge can be recovered.
The Deferi aided the fleet of Klingon Chancellor Sompek when it was damaged exploring the Badlands. Since then they maintain diplomatic relations with the Klingon Empire. They also participated in trade negotiations with the Federation, but until now they choose to remain neutral to both factions.
- This is a canon-contradiction, as Sompek actually was Emperor and not Chancellor. Instead, the sentence most likely was intended as a reference to Chancellor Mow'ga, whose fleet sent out to conquer the Breen was never heard from again.
Government policies are based on polls, so the whole population is directly involved in all major decisions. Officials can always be instated and removed by majority votes as well.
To preserve balance, the Deferi have tried to keep to themselves and not to pursue an affiliation with any major power. However, the growing population on Defera has forced the Deferi to expand and become a space-faring civilization. In turn, contact with other species has recently increased.
- Mining Pod
- Deferi Shuttle
- Mining Bot
- Deferi Transport
- Deferi Frigate
- Deferi Cruiser
- Deferi Battleship
 Missions involved
- Borg Invasion of Defera
- “Trade Deal”
- “Outpost 3 Security”
- “Ore for Outpost 3”
- “Aid the Deferi”
- "Cold War" Feature Series (aka Series 1: The Breen)
- “Aiding the Deferi (Daily)”
- “Emancipation (Daily)”
- “Rescue Deferi Captives (Daily)”
 Duty officers
- As revealed in “Trade Deal”, the Deferi possessed at least one planet near the Rigelian homeworld Rigel V.
- Daniel Stahl repeatedly stated in interviews that the inspiration for the Deferi came from the Capellans of the original Star Trek episode "Friday's Child"
- The Deferi are technically not a faction, since they have no dedicaded faction symbol assigned to them in-game (they belong to the Generic faction).
- Daniel Stahl talking about the Deferi on Red Shirt Army Podcast
- Forum post about creating a Deferi officer on Star Trek Online support forums using the Alien creator
- Capellan at Memory Alpha, the Star Trek Wiki.
- Friday's Child at Memory Alpha, the Star Trek Wiki.
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