In 2017, lead concept artist Qui Fang was developing designs for Overwatch's "Null Sector", a villain group of sentient robots called omnics.

However, as they developed the character into a leader and protector of his people, later iterations leaned into shepherd and nomadic archetypes, giving him a large crooked staff as a main design point.

[4] Triangular shapes were heavily used in his design such as his cape, head and hair, and according to Fang were done to give him an "air of powerfulness, intimidation and just make him feel a little sinister."

The failure of the uprising led Ramattra to more extreme measures; after the surviving leaders abandoned him, he began to forge Null Sector into an army to liberate all Omnics, whether they wished to be freed or not.

Ramattra can convert to his Nemesis form by activating an ability with the same name, which in addition to changing his attacks will also reduce damage taken from enemies and increase his movement speed.

"Void Barrier" will create a temporary shield placed in front of Ramattra, that can absorb incoming attacks for a short duration or until it has taken significant damage, and can only be used in his primary form.

Enemies caught in its area of effect will have their movement speed reduced, take damage them over time, and are forced to the ground if jumping or airborne.

Ash Parrish in an article for The Verge noted that while the developers attempted to make Ramattra fearsome, she instead found him "sexy" from an aesthetic perspective, due to his "long techno braids and his robotic abs" and particularly his voice.

[14] Meanwhile, the staff of United Daily News highlighted his in-game dialogue with Zenyatta as a standout, enjoying that it felt organic while fans drew art of the characters in romantic tension.

While she noted the same Magneto comparison, with Ramattra portrayed as a "tragic, complicated character that goes too far with his tactics in his quest for freedom", she argued it was a trope Blizzard utilized far too often in their works.

She additionally felt the character had issues with racist overtones and cultural appropriation through his portrayal as "imposing android with dreadlock analogues who can turn into hulking mass", furthered by the attempt to make omnics an analogue for racial and class oppression, arguing that it both cheapened the struggles it borrow from but also "sidesteps addressing the justifiable fear humanity would have about invulnerable death machines."