This is a provisional draft. I just wanted to get something up here.
I shall flesh it out more later on. I do need to read more of the background information you have linked.
So I apologised if what I have written is very rudimentary.

Have to go to bed now. Let me know how this is.

Name: Linden Vihix

Callsign/Nickname: Lindsey, Lind, Lindy, Vix

Age: 26

Species: Chipmunk

Appearance: Light blue furred rodent of medium height and build. Roughly 5’5. Has a mohawk hairstyle and wears a pair of red aviator goggles which is perpetually sat on his forehead rather than being used for practical purposes. Commonly wears a black business shirt, a red tie and average trousers/jeans. Wears fingerless gloves.

[img]https://i.imgur.com/8ztdY9V.jpg[/img] [img]https://i.imgur.com/RMvEpZz.jpg[/img] [img]https://i.imgur.com/h1T1URz.jpg[/img]

Bio: Linden is nonchalant and jovial for the most part, but overestimates his abilities and find himself being passively aggressive or sarcastic if he finds himself pulling the shorter straw or on the losing side of the battle. He’ll be sure to get even or revenge if anyone bullies him or plays him for a fool. His heart is in the right place however and even though he has a habit saying the wrong thing at the wrong time, those that get to know him properly will know to take him with a pinch of salt. 

Service Record: Being the runt of his family, Linden has often wanted to prove to his family that he doesn’t need brawns or height to get by. At the time, his family having non-military backgrounds would laugh at him for his pipe dreams. Dismissing him as too weak and uneducated.
Having left home one day however after a divisive family feud, he finally turned his back on them to join the military, and contact was never made again for another 6 years.
Linden decided to return home one day after multiple attempts to make contact with them failed. Upon arriving to his former home he was born and raised in, he was horrified to find it had been completely deserted with no sign or sound of any of family.
Although he is still committed to the military and regards them as his true family, he is still determined to find out what exactly happened to his biological one and hopes that one day he will uncover the truth. Perhaps the sinister happenings and rising contentions of warfare today in Arvara have something to do with their disappearance. 

V-GEAR assignment: VG-0 model

V-GEAR Distinguishing features: Appearance is largely multitudes of blue with red tinted windows. Colours much akin to Linden’s outlook.

Personal Theme: Pendulum Propane Nightmares (celldweller remix)
 
https://www.youtube.com/watch?v=HtY7Szd7WO4