i don't exactly have many headcanons, but the ones i do have are still pretty neat.
but what's my take on nextgen's armor, as i've illuded to before?
i think that nextgen's armor is designed to work with its prosthetic, mostly surrounding their feet prosthetics. the arm prosthetics don't really require much need to be compatable as they're on the forearms. the feet prosthetics can be connected to the armor via the little arrow looking blue things that you'll see on nextgen's legs when it's suited up. the arrow things are split into two segments as to allow for full range of leg movement. the general leg armor (aka not the arrow things) has the ability to enhance speed and lower strength.
now as for the speakers, i'm halfway to figuring out what i think they're for. they're likely for nextgen to speak through, as i imagine it as being a very quiet person. it still doesn't use the speakers much, but they're to make communication easier. the speakers are connected to a power pack on nextgen's back that is also the main power source for the rest of its armor. if said pack runs out of power, nextgen can pop it off its back and open it up to switch out the power packs in there with the ones on its waistband, but the power packs last very long so it's not a frequent thing to worry about.
nextgen is likely a supersoldier for a defense force trained and worked on to protect civilization from a rogue force. sorry if that's vague i'm still working on it
not sure what purpose the blatant beats guy surves, but it's probably just a little friend guy of nextgen.