So... is Kouchuu Ouja Mushiking: Mori no Tami no Densetsu finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Kouchuu Ouja Mushiking: Mori no Tami no Densetsu tells the story of Popo, a young boy living in a forest teeming with insects, including powerful beetles.
Popo yearns to become strong and find his father, the former Guardian of the Forest, who disappeared years ago.
When a strange mist envelops the forest and his mother is transformed, Popo embarks on a perilous journey to find his father and save her.
He faces danger from an evil character named Adder and his minions, who seek to thwart his quest.
Fortunately, Popo is aided by the mighty Mushiking, the King of Beetles, who protects him from harm and helps him on his adventure, guiding him towards discovering his destiny.