OK - I can certify that the mascots pictured do not seem to be either pedophiles or having sex
I am curious to see the opening ceremony myself. I do remember them clearly nodding towards video game stuff in their preview 5(?) years ago. Here is a track list from
RPS:
Dragon Quest - "Introduction: Lotto Theme"
Final Fantasy - "Victory Fanfare"
Tales of Series - "Sley's Theme-Guru-"
Monster Hunter - "Proof of Hero"
Kingdom Hearts - "Olympus Coliseum"
Chrono Trigger - "Frog Theme"
Ace Combat - "First Flight"
Tales of Series - "Royal Capital-Dignified"
Monster Hunter - "Wind of Departure"
Chrono Trigger - "Robo's Theme"
Sonic the Hedgehog - "Star Light Zone"
Inazuma Eleven - (Pro Evolution Soccer) "eFootball walk-on theme"
Final Fantasy - "Main Theme"
Phantasy Star Universe - "Guardians"
Kingdom Hearts - "Hero's Fanfare"
Gradius (Nemesis) - "01 ACT 1-1"
NieR - "Initiator"
Saga Series - "Makai Ginyu Poetry-Saga Series Medley 2016"
SoulCaliber - "The Brave New Stage of History"
I dunno what NieR "Initiator" is, might be something lost in Google Translate. Seems like it might be some version of Song of the Ancients?