Not sure if this is intentional or not, but in the Hermit's Animal People List for your Hermit, there are Choices for Blizzard Man, and Blood Man on the second page.
Choosing either of them kills your seven starting dwarves, but does not spawn a creature of any sort, and your game ends as normal when no Civilians are left.
In addition, if at all possible, I'd like to reccomend some more creatures for Hermit mode, taken from Indigofenix's Mythical monster mod.
Kappa: When their head-plate is wet from being underwater or in the rain, they gain vampire-like qualities. You can spill your waterskin and crawl through the puddle to refill your head. In fort mode, they can be tamed.
Tengu: Ninja crow people who can learn combat skills quickly and vanish in a puff of smoke, but have trouble gaining armor skill.
Satori: Apes that can read minds. They have incredible social skills and many natural skills.
Centaur: Half man and half horse in both body and mind. They have interesting personality traits, being a weird mix of indulgent and cultured. They are also on the big side and their hooves pack a kick.
Girtablilu: Giant centaur-scorpions with a venomous sting.
Pooka: Kobold-sized shapeshifters that can turn into a hare, eagle, cat, dog, goat, horse, bull, or human.
I think, at least most of these 'adventure mode' creatures he has made with his mod, would be wonderful additions for Hermit mode, (perhaps baring pooka due to shapeshifting shennanigans making things hard)
EDIT: Also noted that the Squid Man is on that List. I have NO idea how you are supposed to work that out, as the squid Suffocates almost on the same frame that the Dwarves die when you do the reaction.