A few Owlbrow will spawn at the start. After the base is damaged, Director Kurosawah (Black) will spawn with more Gabriel and Doge Dark, along with Boraphim (Angel). Doge Dark and Gabriel will spawn at a moderate rate throughout the rest of the battle, and another Boraphim will eventually come.
The best way to deal with this stage is to use many meatshields and to deal with the Boraphims as fast as possible. In orther to do this, Ramen Cat is strongly recommended, and so are wave attackers and Long Distance Cats who can take care of the peons. Once the Boraphims are gone, loss becomes near-impossible, so long as you keep spamming stuff.