Mythical forest creatures are legendary beings often associated with forests and woodland in folklore, mythology, and fairy tales. Some examples include:

Centaurs - half-human, half-horse creatures from Greek mythology.
Dryads - tree nymphs from Greek mythology.
Elves - mythical beings from Germanic folklore with magical abilities.
Fauns - half-human, half-goat creatures from Roman mythology.
Gnomes - earth elementals from European folklore.
Mermaids/Merfolk - aquatic creatures with the upper body of a human and the tail of a fish.
Pixies - tiny human-like beings with wings, often mischievous.
Sylphs - air elementals from European folklore.