I designed Whisper’s human form for my Ben 10 Omniverse x Youkai Watch crossover. Since Keita resembles Ben, I wanted Whisper to be Rook’s YW counterpart. I was thinking Future Whisper can disguise himself as a human when he wants to be seen by other humans or when Keita needs an accompanying guardian.
Whisper is Keita’s self-proclaimed butler. Although he is talkative and a bit snobbish, he’s also a polite, sensitive gentleman. He helps Keita and Ben’s gang understand youkais better, but most of his knowledge just comes from his YoukaiPad. Ben and Rook says his original form reminds them of Tiffin, giving much annoyance to Whisper.