Leech Queen
Leech girls are dangerous but often sedentary but a Leech Queen is a voracious predator who gets more powerful the more blood they take into themselves. They can attach to prey and suck from them or swallow them down. Luckily they do not have a huge number of abilities without blood other than a few tenticles to restrain and attack.
Powers: Bloodsucker, Powered by Crimson
Personality: Leech Queens are regal and excited beings they are hedonistic loves of blood but can be reasoned with through trade. They accept offerings of blood and even grant gifts and boons to adventurers who give them blood.
(Warning: Leech Queens often sit near dungeons and may have access to magical equipment)
(Tip: Poisoning oneself is dangerous but can weaken a bloodsucking monster)