Enneacraft – Atoriϝ.MAR
Full art:

Before transforming:

Red shape: “Small octahedron which counts sins”
Top right: “=> Transformation”
Bottom right: “The glowing lines become the division lines between the parts”
Blue shape, clock-wise from the top-right: “Head part”, “Middle ring (blinks intermittently)”, “Spine part”, “Tail part”, “Fin parts”, “Mouth part”

Enneacraft mode:

Design:

“A bone-like body inspired by the concept of ‘fear'”

Fins:

“Fins with sci-fi-like effects”

Top:

Left: “The ‘suspended threads’ are effects inspired by ‘a whale’s spouting'”
Middle: “Core”
Right: “An effect that represents a network which detects invisible sins”

Source.

Killer Tune Reco
Full art:

Eyes:

“Record eyes”

Boots:

“Tonearm boots”

Symbol:

Top symbol: “Facing front”
Description: “Maybe there is another face…or maybe not…”

Hair:

“An abnormal amount of hair”

Preference:

“Make it spicy level 10”

TL note: This specific wording (10辛) is often associated with the chain CoCo Ichibanya, which specializes in curry. Yu-Gi-Oh has done some collaborations with them in the past.

Juke Joint “Killer Tune”:

“KT Assistant: Jockey, The Visible Hands”

TL note: Various cards from the Hecahands theme are written as “The Invisible Hand(s)” (見えざる手, miezaru te). This seems to be wordplay inverting that name.

After the performance:

Top: “Each one thinks they were the best”
Mix: “Hehe…that was a lot of fun~”
Cue: “This time, as always, Cue was the best”
Clip: “THE MOST EXCITING ONE WAS CLIP! ARE YOU EVEN LISTENING?!”
Reco: “Huh…”

TL note: Cue uses its own name as a first-person pronoun.

Source.