Explosion

Explosion ( Bakuha) is the Quirk used by Takashi and Katsu Bakugo.
Description
Explosion allows the user to excrete nitroglycerin-like sweat from their palms and ignite it at will to create explosions of various sizes.
Through either one of their palms, Takashi/Katsu creates fiery shock waves that are highly powerful and destructive, often burning and/or shattering whatever they hit, with Takashi/Katsu themselves being immune to them, save for some recoil. Because this Quirk generates light, it's a natural counter to Dark Shadow, which thrives in the dark.
The more Takashi/Katsu sweats, the more powerful the explosions become. This essentially means that Takashi's/Katsu's blast gradually grows in power the longer they combat since they will naturally sweat more through ongoing physical activity.
Weaknesses
During cold weather, the nitroglycerin-like sweat requires a slightly longer time to detonate, as opposed to warm weather, where conditions are optimal for ignition.
Repeated explosions, particularly large ones, eventually result in throbbing pain to Takashi's/Katsu's arms and shoulders. Additionally, creating explosions with both arms at the same time causes their overall strength to disperse between both limbs, leading to individually weaker blasts.
Due to them being limited to producing explosions from only their hands, which are also where their Quirk Factor is, Takashi/Katsu will be unable to utilize their Quirk if they lose the said limbs.