The type of gamer who aims for the 100%, the best ending, and spends months grinding his characters and getting all the rare items until he realizes the futility of all and ends up abandoning the entire game altogether.
For example, the incompletionist plays
Castlevania: Symphony of the Night, gets the regular good ending, covers 200.2% of the map and gets 99% of the enemy list. The rest, according to the incompletionist, ain't just worth it.
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