Well I'll post in my ideas so far.
Lamias
Grapple: Slides bulk of tail (where the human waist connects to the serpent half) between heroines legs forcing her to straddle it, the tail comes up over her hip to wrap around her belly, coiling around and around, possibly forcing the breasts to bulge out between the coils, the thinner end of the snake tail wrapping around her throat, possibly the tip forced into the heroines mouth.
Ogress/Oni
(I can't remember the artist, they did a series of monster girls with descriptions ... think something like the Red Oni in this case)
Bearhug: Wraps arms around heroine lifting her off her feet, crushing her against her own body with her face wedged between the Oni's cleavage.
Pummel: The Oni grips the heroines wrists together in one hand lifting her up into the air so she dangles from her grip and pummels her belly with her other fist.
Atomic Drop: The Oni lifts the heroine up under the thighs and drops her crotch first across her knee.
Arachnia (Spider Lady)
Not sure yet, I've seen an image of one laying eggs into a woman .... perhaps ones that do some bondage style attacks with webs, mummification type attack.
Essence Drain: The Arachnia lifts the heroine upside down, with her knees over her shoulders and 'bites/sucks' at her pussy in the vain of a spider draining its victim of its essence.
Over ideas I'm toying with.
Hornette (Waspwoman akin to Darkstalker Q Bee.)
Vampiress
Succubus/Demoness
Harpies
Werecats
Scylla (Octopuswoman)
Dryads
Mummy (Less rotten and more bandage bondage)