This is a great thread idea, Ven! I invested some time into gathering some ideas for you.
Togetic (Pokémon) and Enzerun, Enzerutoppo (Sanrio Timenet) look similar. They are white creatures with wings, so are similar to fairies, with Enzerun, Enzerutoppo specifically being based on angels.
Cyclone monsters: Torunedon (Sanrio Timenet), Rhodanth, Gust, Tempest (Telefang), Wind Beast (Dragon Quest monsters),
Horned devils: Deathmore and Deathmore II (Dragon Quest Monsters), Doomsday (Telefang)
Unicorn (depicted as a creature with a long horn, often a white horse): Rapidash (Pokémon), Unicorn (Dragon Quest Monsters)
Resembling Mermaids: Florges (Pokémon), Ningyo (Yokai Watch), Izanami (Yokai Watch), Yao Bikuni (Yokai Watch)
Sentient trees:
Friendly looking trees: Sudowoodo (Pokémon), Daibokku, Daijukku, Daimankai (Sanrio Timenet)
Scarier looking trees: Phantump, Trevenant (Pokémon)
Jewish legend:
Golems (animated anthropomorphic beings made from inanimate material like clay): Golem (Pokémon), Regirock (Pokémon), Regice (Pokémon), Registeel (Pokémon), Golett (Pokémon), Golurk (Pokémon)
Japanese folkore and culture:
Jibakurei (a spirit strongly attached to the place of its death because of strong hatred): Jibakurei (Shin Megmi Tensei), Spiritomb (Pokémon)
Hitodama (souls of the dead departed from their bodies) or creatures reminiscent of European will-o'-the-wisp folklore:
Candles: Litwick (Pokémon), Mr. Dorukyan (Sanrio Timenet)
Candleholder: Seikarannā (Sanrio Timenet)
Sentient lamps: Lampgera (Telefang), Lampent (Pokémon)
Chandelier: Chandelure (Pokémon)
Hi no Tama (embodiment of fire): Gastly (Pokémon) (similar to a Sōgenbi). Gajibobo (Sanrio Timenet), Hinotama (Yu-Gi-Oh!)
Teru teru bōzu (these ghost dolls are hung up for good weather): Teriterībōzu (Sanrio Timenet), Castform (Pokémon)
Human obake/ghosts: Ogikuchan (Sanrio Timenet), Pampas, Cliogera, Vikingurin (Telefang)
Yuki-onna (snow woman): Froslass (Pokémon), Frostina (Yokai Watch), Blizzaria (Yokai Watch)
Tsuchinoko (legendary snake like creature): Dunsparce (Pokémon), Noko (Yokai Watch), Bloominoko (Yokai Watch), Pandanoko (Yokai Watch)