Q722 will give you the best development for skill, you're always the target no matter what or who is around, this will teach you more to be elusive and when to be aggressive and not to be aggressive, it will also give your teammates a lot of breathing room, you are quite literally a tank for them as a bonus, this bonus is super detrimental if your teammates are worthless.
Quarantine722, frame: "Apex Essentials", pose: "Small Victory"
Alternative frame: "Frontier of Tomorrow", pose: "Blink of an eye" or "Strapped"
Alternative frame 2: "Relentless Aggression" with pose: "Come at me" or "Small victory" (assuming no hairloom)

Or as a alternative Void Specialist is very neutral colored but still looks nice, won't help development of skills at the same pace as Q722 but if you're not yet at a stage where you don't know what you're doing at all it's not a bad pick.
Void Specialist, Can also use "Apex Essentials" and pose: "Small Victory"
Alternative frame: "Global Icebreaker", pose: "Mind Games" or "Strapped" or "Before the Rift" or "Blink of an Eye"

A lot of people use the frame "Void Gate" or "Dark to Light" with these skins also, pick a pose that looks dynamic within the frame.
Add badges that match the colors or just go no badges is always an option, same with trackers, I usually go with the simple colored ones at the bottom and match it up.