Bro. A suggestion is where you would actually design the weapon and suggest it to OOO. Don't just say we need new weapons.
Also, we need more content first in my opinion.

Magic, fusion weapons, stuff I posted before. (I still want magic in the game :P)

Hello, I am a traveler from the Treasure Vaults to add an idea so surprising to you all, you will be petrified with shock. This may be the last you ever hear of me, so read closely. What if...we could....DUAL WIELD!!! Of course, they would have to be weapons that do the same type of damage, but wouldn't it by nice to hold two Argent Peacemakers or...two Dread Venom Strikers?

Or maybe Staffs, two handed, with quick and outreaching strikes, but short swipes to balance it out. And the charge shooting out status attacks in four directions! And part of this staff family being a scythe, which could shoot out a blast like the Brandish-line, but it having a pure-status attack like 5* weapons, being amazing once at the end of it's alchemy path. AND (OMG he's not finished?!) CLAWS! Powerful, up close strikes that can leave a bleeding damage, like a fire, but normal damage on all creatures! And the charge leaving one of these gaping bleeding damages.

I leave now, with the gift of an idea in my wake...

*walks back to Treasure Vault*

Even though your fanfics is okay.......

Dual wield is not original and if OOO implements dual wield like that the game becomes downhill.

Fine, I tried.............this thread is made to spread ideas right? Well, if I could, I would share my equipment ideas, but I think I just got banished :D

No, this thread is made so that people can put ideas here and the OP (who will never show his face in the thread again) can come back later and claim all the credit for said things being implemented in the game.
You never post ideas in "I'll let you guys suggest stuff" threads because it's a waste of time.
What you're supposed to do when you come up with an idea:

1. Use the forum's search bar. If this reveals no similar ideas, go to 2. If you find a similar thread, go to 3.

2. If the forum search bar fails, use Google to search the Spiral Knight's forum. If you find a similar thread, go to 3.

3. If you find heaps of threads on exactly the same subject, go to 6.
If you find only a few threads, read through them. If general reception for the idea was bad, go to 7. If general reception was good, but not much attention was gained, go to 4.
If you find only a few threads, but they weren't filled out with as much detail as you want to come up with, go to 4.
If you find no threads whatsoever on the topic at hand, go to 5.

4. Before creating your thread, go through every thread with a similar topic, and compile all the good info from each of them. You will gain far more respect if your posts are full of information, thought out, formatted well, and are interesting. Post your thread. Do not bump it like mad, if the idea doesn't gain attention, it's probably not a very popular one. Go to 7.

5. Create your thread, making sure to format it well and make it neat, with as much information as you can come up with. Respect your posters, and don't get angry if your idea is critisized. Go to 7.

6. You should probably drop the idea, it's not original at all. Someone has probably created a thread with far more detail than you could come up with: if you find such a thread that has an enourmous amount of info, bump it while adding your new info. Make sure that it is the most filled out thread of its topic. If the topic is an old one (older than 2 or more months), make sure you add a good reason for necro-bumping it. Go to 7.

7. Congratulations, you have followed the correct procedure for bringing your ideas to the forums!

By the way, if you're interested in Dual Wielding, I created a thread using step 4 here.
It's a bit of a read though.