Obviously:
- Obsidian Onis
- Jorogumo
She also likes Yasonori, Kamaitachi (Card Draw, Heal, 2 Pushes), Terracotta Warrior and Katanaka Snipers (douple Focus? Yes, please).
You can play her with many other models, but that covers already the most. Always worth considering are Ten Thunder Brothers, The Dragon and Monks of Low River.
Her Henchman, in my opinion, is one of the best Ten Thunders have. Unfortunately Ohagaru eats a lot of cards, which bites a bit with a Summoner Master.