Hi! I'm looking for some yaoi manga with supernatural/shapeshift characters, such as the seme/uke being werewolf, or has special powers. Any suggestions?

Sort of what your looking for:

Remnant: Jujin Omegaverse
Pendulum: Jujin Omegaverse

Red Hood
Coyote (Zaria)
Mauri to Ryuu
Neko Neko Honey
Kami-sama no Iutoori (MOEGI Yuu)
Kamisama no Uroko

Thanks! I'll give them a read 😁

Another category in the supernatural, anybody know some good vampire manga? Yaoi or shojou, either is fine. Suggestions?

These are only some vampire stories that I've read.

Completed
Eien no Yoru no Hate
Kamu Otoko
Haru to Kyuuketsuki
My Little Vampire
Hana to Junketsu
Father's Vampire
Dia Game

Manhwa
Blood Link
Blood Bank
Vampire And Hunter
Sweet Man
I'm Yours, Blood and Soul
K's Secret
Welcome to the Intimate Night

Ongoing
Shinitagari no Vampire
Kyuuketsuki ha shinzo no yume wo miru (this is good that it hurts)
Red Beryl ni Sayonara

Thanks! I'll try them out