Past 7 Primordial Demons React to Future

Character Introduction

(Before we start the reaction let us know first who are the ones doing the reaction)
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Primordial Demons:

Primordials (原初の悪魔, gensho no akuma, lit. "Primordial of Demon") also known as Progenitors or Primals, are the oldest and most extraordinarily powerful Demons. According to Leon Cromwell, each of them is referred to by their signature colors rather than an actual name.

These "substitute names" don't count as their actual names in the true sense of being a named monster:

Black Primordial Noir (Diablo)
White Primordial Blanc (Testarossa)
Yellow Primordial Jaune (Carrera)
Purple Primordial (Ultima)
Red Primordial Rouge (Guy Crimson)
Blue Primordial Bleu (Rhein)
Green Primordial Vert (Mizary)

7 Primordial Demons

Black Primordial Noir
(Diablo)

Appearance:

Black hair with streaks of red and gold, as well as golden eyes, Noir was finely dressed in garments like that of a prince. Other than that he looked like a normal human, though he was able to unfold wings as well.

Personality:

Diablo is whimsical but also very calculative when he wants to be. He usually shows an absolutely composed attitude, but whenever anyone insults Rimuru, his polite exterior turns into a cold form of malice and he proceeds to punish the "sinner" in the most painful way imaginable unless it goes against Rimuru's orders. However, when someone has a good relationship with Rimuru, Diablo usually treats them in an amiable way, though he might still
manipulate them for his own ends, with "his own ends" usually referring to being close to Rimuru more often.

Diablo follows Rimuru's orders to the letter. When tasked with increasing the difficulty of Framea's test as a guard for guests to Tempest, Diablo summoned a moderately strong monster. The moment Framea got paralyzed by the creature's goo and still showed a will to fight, Diablo sent the creature away and went to report back on Framea's actions. Should there be some "grey area" in his instructions, Diablo has the freedom to carry out his orders how he sees fit.

The greatest show of Diablo's loyalty to Rimuru was recruiting hundreds of other demons (including the last three Primordials) to serve his master; the creation of the Black Numbers, who became the de facto strongest fighting force in Tempest.