There's a duality in Kousuke's character.
On the one hand, he's a go-with-the-flow, subby type of dude. Generally willing to take orders, doesn't get upset when he finds out some of the women take advantage of him while he's asleep because demi-humans regularly practice polygamy and he's already neck-deep in their culture, and he mostly wants to spend time collecting resources, making things, and spending time with his ever-expanding harem (chosen not by him, but by the women who want to be with him and with the consent of the remaining women).
On the other hand, he's capable of extreme levels of violence and destruction. This hasn't been shown in the manga yet, but in the novel Kousuke has the ability to create magic jewel bombs that explode like an atomic bomb (blast radius of ~1 mile) with similar (albeit magical) fallout. He has mass produced crossbows and bolt-action rifles, but he's perfectly able to do the same with machine guns and rocket launchers. In volume 8 (most recent volume as of today), he's given the idea of using his Bestowing Workbench (a workstation that bestows enchantments on items placed in it; he can't pick the effects, but they're standard based on the item placed inside) to bestow his AK-47 with enchantments. Turns out, one of the gods monitoring the situation was waiting for this to deliver a message to Kousuke: stop holding back. The gods would be quite happy if he razed the entire Holy Kingdom to the ground and slaughtered them all. To this end, when he took his AK out of the bench, it was imbued with Infinite Ammo, Self Repair, and Enhanced Piercing. He later makes big golems with minigun arms that were imbued with those enchantments and between the golems and his jewel bombs, he massacres THOUSANDS.
Looking forward to the next bit, though. Enter Grande!