Holding their heavy artillery weapons called Cannons, they are outlaws of the MS2 Mesos battlefield and ruin everything with a look to their faces. With dexterity their strength, and powerful weapon, they are hard to work with. Their unpredictable and bizarre natures mean problems with those brats.

The Heavy Gunner is in Kerning City, where they work as hired scientists mercenaries in the' Talisker' area. A number of them used to be hot-blooded people in Maple World. These scientists provided them superior weapons so they could become stronger but due to their free-spirited character, the team mentality was feeble. Now, many Heavy Gunners are running rampant all over the planet, displaying their power.

With glossy and crafty movements, their enemies beg for Maple M Mesos mercy. Faster than light, they swing their daggers in both hands because their enemies fall to the ground.Instead of morals and justice, electricity is what matters in alleyways, which is where the wandering rebel Jonathan Button and his band of followers, Thieves, started. They reside openly without the others telling them which some people envy Though they are outsiders who denied society.