Torajirou Asuka: Shiho Kokido (Sekkou Boys) and Musimon: Nao Tamura (Log Horizon)
Eri Karan: Umeka Shouji (World Trigger) and Dokamon: Motoko Kumai (Major)

Source: Animate TimesEri Karan: Umeka Shouji (World Trigger) and Dokamon: Motoko Kumai (Major)

Update July 13
Two additional cast members were added via the official website.
Source: Animate Times
Update July 20
The official website has announced three additional cast members for the anime.
Yuujin Oozora: Makoto Furukawa (One Punch Man), Ai Kashiki: Mai Fuchigami (Ansatsu Kyoushitsu (TV)), and Watson: Ryou Hirohashi (Working!!)

Source: Animate Times

!['Digimon Universe: Appli Monsters' Additional Cast Announced [Update 7/20]](https://cdn.myanimelist.net/s/common/uploaded_files/1467798781-df438666a9fb126f13bd0ff3077bd87a.jpeg)
