This is Before the ya know, the story and stuff, imma try my best and make it well! I mess with Keicho heavy and his stand would be super strong if used right.

Most of this stuff came from here! ↓↓

the Jojo Wiki

Bad Company (極悪中隊バッド・カンパニー, Baddo Kanpanī) is the Stand of Keicho Nijimura, featured in the fourth part of the JoJo's Bizarre Adventure series, Diamond is Unbreakable.

Instead of a single entity, Bad Company manifests as a whole army of miniature soldiers and military vehicles, with all the firepower it implies. They serve Keicho without question but are shown talking to one another and making very careful maneuvers.

Keicho Nijimura (虹村 形兆, Nijimura Keichō) is a secondary antagonist featured in the fourth part of the JoJo's Bizarre Adventure series, Diamond is Unbreakable, specifically in the "The Nijimura Brothers" story arc.

Keicho is Okuyasu's older brother. He is the first in Morioh to possess the Bow and Arrow and liberally creates Stand users in hopes one of them can kill his monstrous father. Keicho himself is a Stand user and his Stand is the miniature army, Bad Company.