I know this sucks, please give me advise on how to improve.
Not all the Quarians fled to the flotilla when the Geth turned on them. A few left and became dedicated to the elimination of the Geth and subsequent reclamation of their home world. Most train as assassins, striking from the shadows, and returning there just as quickly.

I kept messing up on the medium armored one, so I just said forget it. Look at Mr. Man on the left labeled "Light"
Appearance General: Almost all of them are cybernetic, not letting their immune systems weaken like the Quarians did permit them to exist outside of a suit. Almost all wear armor at all times, seemingly prepared for action at a moments notice.
Clothing: Cybernetic plates, and armor.
Height Range at Maturity: 5'7"-6'0" (Living on worlds and constant training have let them not shrink like their Quarian cousins.
Weight Range at Maturity: 150-185 lbs.
Skin Color: Most have skin in hues of green, blue, and purple.
Eye Color: White, yellow, blue, and rarely red.
Biology: Same as Quarian except for the noted following. Heavily cybernetic, normal immune systems. Average life span is low due to constant conflicts with the Geth, however one subject has been noted to life for over 200 years.
Culture: A heavily militant culture, every person is a soldier, and every one has to serve. They trace their origins back to when they fled the flotilla as soon as it became clear the counsel was not going to fight the Geth.
Government: Martial law is always in effect. Everyone has a rank the day they are born from "sub" all the way to the top "Commander in Chief"
Military: Not sure what to put here.
Religion: While not a religion, they do have a form of worship called "dedication" in which they honor the fallen.
Technology: Heavily cybernetic and most attached to their own bodies. They favor close combat blades or long range sniper rifles.
Economy: Among each other they use a form of class selling. That is anyone of a high class can take what ever they want while the lower ranks just get what they need to survive.
History: At the original flight from the geth over 300 years ago, everyone thought it to be a temporary measure. Most thought that they would get enough support from the counsel to go back and quickly re-take their home world. At the counsels refusal, one Admiral took his fleet and fled the Quarians, landing on an uncharted world by the veil. There he created a training program that every member of their group had to follow, and ever since have been dedicated to the destruction of the Geth, and the reclimation of their home world.
Relations:
The Shri'la admire the Turians dedication to military service, and treat them with great respect and honor.
The Krogans they are not as fond of, finding their tactics far too aggressive, and their own species killing itself off. However, they will never turn away a Krogan if they are willing to help them.
The Salarians, Elcor, and Volus they view as weak, and ready to be slain. They believe that the only reason they are still alive is because of the counsels graces.
The Shri'la still have a deep love for their Quarian cousins and readily welcome them in any situation. They believe that it is not to late for them to join together and take back their home world.
The one race the Shri'la hate, apart from the Geth, are the Asari. They view them as the reasons the counsel did not act and stop the Geth when they first came out. However, they are willing to give individual Asari a chance to prove themselves,