Ok, straight into it, these are my ideas.
A gun with homing bullets.
A gun with with multiple bullets. Not a spread we have the Autogun for that! One with a certain configuration e.g. side by side etc.
A laser.
A weapon that has a chaining effect, as in "chain lightning".
Bullets that travel through an enemy.
This gun with a homing effect could have multiple bullets as well, it could chain and it could mix up with pretty much all the other ideas excepting a laser and traveling through an enemy.
Besides that you would have to think of how fast it goes, the time before it disappears, whether or not it has a maximum distance the bullet can go ( a radius), how and to what extent the direction the bullet was fired effects it and lot of other factors.
I think multiple bullets is self-explanatory.
A laser in spiral knights works on the principle of that it's instant. Most obviously this means it can't be dodged in multiplayer an would have to carry a heavy nerf. e.g. A one shot combo (the blaster has a 3 shot combo), low damage etc. This is the most obvious use for the chain effect and could work well if used properly.
Chaining could work with swords, guns and bombs. It would most likely have a certain distance around an enemy that a new enemy could be hit from.
The 2 most obvious limits you could set on this would be a limit to the number of enemies it could hit or decreased damage further away from the initial hit until the damage reaches zero after a certain number of hits.
Projectiles that could travel through enemies would most probably have pircing damage and travel quite fast so it can't hit a enemy twice. This is a small nerf in itself as slimes are the most likely to group closer together and be an easy target for this gun, but they are resistant to pircing damage.
Please consider these ideas and add to them.
Fropps out.
I can't believe I'm doing this already!
Bump.