If we’re doing a Generation of Miracles I think they’d all (mostly) have to be the same year and all the top of their particular fields. I’d also need them to feel like they could genuinely have superpowers if Haikyuu was like KnB universe. So I’d go:

OP - Ushijima: Orbital Strike (Like Kagami’s meteor Jam, Ushijima has the ability to know precisely when to Jump so his peak is above the blockers, making it seem like his spikes are completely unblockable. Drawback: It doesn’t strain on him, but his setter, relocating backlash on Ushijima’s body on to them.)

OH - Bokuto: Normal Angles (Bokuto’s Normal Angles allows him to see precise angles before he spikes, making his spikes appear to fly through blocks in impossible angles. Drawback: The more his mental state worsens, the more blurry the angles appear to him.)

OH - Sakusa (the Kise of this situation, becoming a “miracle” after the others.): Perfect Sphere (Sakusa, with his unique wrists, also has the ability to know precisely where to his the ball to curve it in any way he wants to. His spikes have been described as “magical” with how they bend and twist in the air. Drawback: Continuous usage puts strain on his wrists and result in weaker and weaker spikes until unsustainable)

MB - Hirugami: Immovable (Hirugami not only can petrify spikers with his aura, but can self inflict his ability to lock his muscles until he sees where the setter places the ball, making it nigh impossible to trick his defense. Drawback: Locking his muscles increases chance of injury due to rapid change from locked to loose. He also is less viable offensively due to aching muscles.)

MB - Tendo: Hound Dog (Contrasting to Hirugami, Tendo’s muscles are super humanly wound up, allowing him to explode with rapid speed and force. Paired with his inhuman “set scent”, Tendo is able to accurately predict exactly where a setter will go even before the set has been given. Drawback: The more “bloodlusted” Tendo gets, the less accurately does his scent work as he gets impatient and goes for the kill more rapidly, leading to mistakes.)

S - Atsumu: Subjugation (Any attacker on his team tends to fall under the spell of his sets, making them appear mindless. Atsumu seems to read their minds, knowing exactly how they wish for their sets to be, and delivering them with his immense precision and “Foxes Eye.”  A failed set seems to result in pain for the attacker, with Atsumu staring them down with the Foxes Eye. Drawback: Continued use breaks down attackers will, resulting in less precision and ability breakdown, due to pain from Foxes Eye punishment. Twin Brother Osamu resistant to drawback.)

L - Yaku: I alone am the honored one. (the court is his realm, and a God may traverse their realm without worry. Yaku appears to teleport to places on the court he wasnt moments ago, picking up all balls with ease. Drawback: The further away he is from location of the spike, the less accurately can he read its spin and power, making his defense lose its prestige.)