HEY! i was thinking that this game needs some more fun guns so i was thinking maybe a Crossbow/shotgun type think with a spiral knight things on it and or a rocket gun for those extra misson packs crimson hammer misons, and the rocket gun can have slow moving rockets but small and pack a punch, also i was thinking a, or even holding two guns at once would be fun, and would could incorporate this idea in to the swords like having 2* sword in one hand and 4* sword in the other.
these are only suggestions but i hope you get inspiration from them and new ideas might from!^_^
Because I'm a massive killjoy, I'm going to list out why none of these work:
Crossbow- Doesn't fit the theme and you gave absolutely no details or mechanics.
Shotgun- Use the search bar before posting a suggestion. And bloody hell, there's another shotgun thread on the first page!
Rocket gun- http://wiki.spiralknights.com/Pulsar
Dual wielding- There will not be dual wielding because you need a shield for anything past T1.