Before the main art style became anime-inspired in Generation 3, Generation 2 had an odd art style divide. Any story originally created in RPG Maker MV, and its characters, would always be draw in this style.

The protagonist mark is a unique attribute given only to the protagonist of a story. Each generation has its own common protagonist mark; like the ahoge in Generation 3, for example. You can read more about protagonist marks here.

In the Gaboza's Killing Game series, specifically Gaboza's Killing Game V3 and Gaboza's Killing Game: Ivy League, characters are drawn in an art style that more closely resembles the art style used in the Danganronpa series.