Yugi: Yugo
Yami: Yummy
Joey: Kangaroo
Tristan: Tris(sun)tan
Tea: Coffee
Ryou: R You (R U)
Bakura: Bark-ura
Marik: Ma-rick
Malik: Ma-lick
Pegasus: Horse
Atem: A Tem (Undertale reference)
Heba: She-ba/ He (sheep noise)
Solomon: Solotues(day)
Rebecca: Re(chew)bacca