So let's start with making him a new style cuz he done a lot of stuff in anime/manga to be included so how to get it you know the dangan move so make the armor Upgradeable (only by getting more moves cuz it's already best armor) by talking with shop NPC and getting all the stuff with your money let's start the movement
1mh5 shot:you take a shoulder plate and shot the mh5 from it causing a big (10 blocks I guess) purple smoke appear that lasts for 3 seconds and affects anyone that doesn't wear mh5 mask hunger and nausea,posion effects lasting for minute mh5 bullet gona cost a lot
2flamethrower you pull a flamethrower out of ur wrist and set people on fire cuz isn't supposed to deal big dmg
3spiky bullets barrage you use sticks as ammunition and and fire them more accurate than dangan and has a good fire rate
4th the spiky blanket you cover yourself with it for few seconds and you will reflect any dmg dealt to you
5th explosive marbles you throw a bullet sized explosive with enough force to make it explode on contact
6th dangan stays the same but a bit faster fire rate
7th not really a move but battle spear should deal a bit more dmg
I guess Its the most unnecessary I could have ever made but yeah don't make dangan the only Don krieg move
8th is fake mh5 you shot a bullet looking like mh5(big dark purple thing) but instead of causing posion it just explodes ( I can't think of any way where it could hit people with shurikens)
9th is fishing net that works like any projectile and stuns the victim for seconds