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Yup, that title is pretty self-explanatory. These are the Kuva version from their original weapon, except for Tenet Envoy because Tenet Envoy only available on it's Kuva version (there is no normal Envoy).
Sure thing, here are some of the build I also copied. Credits goes to these creators.
You see, Mirage has her first skill, Hall of Mirror, where Mirage will summons her doppelganger/clone. These clone are able to wield and use the same weapon that currently equipped, be it melee weapon, secondary weapon, or primary weapon. In this case, Kuva Bramma / Tenet Envoy.
Next, we need to add multishots mod to Kuva Bramma/Tenet Envoy. The bigger the number of multishots is, the better this meme build will be. Multishot means that every time you fire the weapon, it's projectile will multiply.
For example, Tenet Envoy will fire 1 missile, using 1 ammo, but when it exit the weapon barrel, will multiply into 2 or even 3 missile. That's just from one Mirage. Hall of Malevolence will summons around 4 Mirage clones, but only 2 clone that able to fire the same weapon.
So, if we do the math :
1 Mirage + 2 clone (3 Mirage), multiply by 3 missiles = 9 missiles
That's just from 1 ammo. Tenet Envoy has approx. 8 ammo, so multiply 8 with the 9, you get 72 missiles. At this point, you have HIMARS but damn good at acrobatic maneuver.
Lastly, go to your video settings, and change the GPU Particle to "High"
Bonus: Paired with the augment "Hall of Malevolence", these doppelganger will deal additional 5% damage for each kill.