The list of toku actors for Garo 3 is pretty good

• Sato Hiroko has been in other toku shows such as Faiz, RyuKenDo, and Decade.
  • Imura Kumi was co-stars with Hiroko in RyuKenDo. She played the main heroine, Sakyou Rin. Her role in this series is unknown, but her name was listed in the youtube trailer for the show.
• Ikeda Junya was previously GokaiSilver on the show Kaizoku Sentai Gokaiger.
• Tsuda Kanji previously played Rekka's father in the Garo Red Requiem movie. He has had many cameo roles in toku, perhaps being best known for his role as Editor-in-Chief in Ryuki and Takeru's father in Shinkenger.

Found this out writing up the actors' names for the wiki.