
Quick answer — Satoshi Mikami voices Douglas Billingham in DOUBLE DECKER! DOUG & KIRILL, Ian Izetti in The Reflection, Antoni in Orb: On the Movements of the Earth and 23 more characters.
Satoshi Mikami voices Douglas Billingham (DOUBLE DECKER! DOUG & KIRILL), Ian Izetti (The Reflection), Antoni (Orb: On the Movements of the Earth), Kumado (MUSHI-SHI The Next Passage), Jerome Karlsthal (86 EIGHTY-SIX), Sensei (Black Butler: Book of Circus), Akira (YATAGARASU: The Raven Does Not Choose Its Master), Testa Laguza (91 Days) and 18 more.
Douglas Billingham is voiced in Japanese by Satoshi Mikami.