What I love about niche gacha games like Girls Frontline or the various shipgirl games like Kantai Collection and Azur Lane is if they run long enough, they eventually run out of the most well-known examples and have to start dragging in the oddballs and writing game mechanics around them. For GFL, it's bringing in prototype guns that never went into production (ex: G11 & XM29), have achieved meme status (ex: Kolibri), or are infamously bad (ex: ZiP).