So... is Choujuu Densetsu Gestalt finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: February 21, 1997
Manga finished: January 01, 2001
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Choujuu Densetsu Gestalt is a story set on a mysterious and dangerous island called "G," a place feared for its connection to the banished god Gestalt.
Father Oliver, a priest seeking the truth behind the island, journeys there after leaving his order.
He encounters Ohri, a young girl with surprising magical abilities, and they begin to travel together.
Meanwhile, Suzu, a dark elf hired by Oliver's former order, is tasked with bringing him back.
Suzu's mission is complicated by Ohri's power, and the duo face numerous threats from the island's monsters and magic users as they pursue their goals.