AC references:
Himari's wheelchair is designed after EL-TL-11 FORTALEZA leg part.
Kei's arms are DF-AR-09 TIAN-LAO and her head has DF-HD-08 TIAN-QIANG on top of it.
Her weaponry is IRIDIUM and LITTLE GEM on hand, WR-0999 DELIVERY BOY and BML-G1/P07VTC-12 on back, which four of these references "Chatty" Stick's AC CIRCUS.
Aris is holding PB-033M ASHMEAD pile bunker.

MSLabo102 said:

AC references:
Himari's wheelchair is designed after EL-TL-11 FORTALEZA leg part.
Kei's arms are DF-AR-09 TIAN-LAO. Her weaponry is IRIDIUM and LITTLE GEM on hand, WR-0999 DELIVERY BOY and BML-G1/P07VTC-12 on back, referencing "Chatty" Stick's AC CIRCUS.
Aris is holding PB-033M ASHMEAD pile bunker.

if not mistaken the head on Kei as well is Tiang-gang head as chatty uses the Basho head

Algester said:

if not mistaken the head on Kei as well is Tiang-gang head as chatty uses the Basho head

It was just weaponry.