The user can create fire that explodes or turns anything that the fire burns into a ticking time bomb. Whatever the user's flames come into contact with starts to burn then explodes in an incredible volatile manner.
Izuku Midoriya (Deku) and Katsuki (Kacchan) Bakugou's Son
Hinamori (Bleach) using her Tobiume to release fireballs that explode on impact.
Rei Ōgami (Code:Breaker) using Mammon, the Dichromatic Twin Flamberges of the Netherworld, hot and cold flames that can create a violent explosion when combined together ...
... and here using Asmodeus, the Iridescence Explosive Flame of Hell, to chemically react with the surrounding alloy, creating a violently deafening explosion of differing colors.
Ryūji Sendō (Code:Breaker) using his Ignition ability to ignite anything he aims at, creating an explosive blaze.
When Kratos (God of War series) aquired Threa's Bane, he was able infuse his Blades of Athena with fire, allowing him to burn his enemies and afterwards implant searing cores into them which will explode after a few seconds.
Luffy (One Piece) using Red Hawk to launch a fiery fist that explodes on impact.
Lucia (Princess Lucia) uses a magic circle to summon a pillar of explosive flames.
Ling Ling Huang (Rosario + Vampire) using Ayashi Art: Fire Hell Circle to generate explosive flames that will destroy everything caught within, including herself.