The common fix topic:
Defense
currently, the game is damage>defense, that would be ok, but sets that should give high defense(like the plate line or ancient plate) don't work because only 25% of the specialized damage will be absorbed, so how about changing this to 50%.
All Defenses for all lines
The plate and chroma line could need a shadow defense set, maybe with different bonuses
Fix the Bars
You know how the gear shows the defense bars ? It seems like OOO guessed instead of calculating them when they made this, some weapons are a lot faster than the bar tells you and some sets like ancient plate or the plate line have more defense that can't be shown correctly on the bar.
Enemy Damage rebalance
I can undestand that OOO thought how "powerful" a attack should be, but some are way too fast/almost unavoidable and do tons of damage
Enemy Attack dodging
I can understand this since they are supposed to be harder, but I don't want to imagine how annoying this is for gunners when you are fighting in a arena with mechaknights.
Chaos/Mad Bomber
The only advantage of mad bomber is that you have the demo line while getting the gear, other than that chaos is more useful, chaos is also supposed to have debuffs against all "elements", so add sleep and stun too.
Weapons that trade damage for a status effect
Seraphynx's other ultimate beam, the poison blitz needle, Cold Iron Vanquisher. That are some examples of that, cold iron vanquisher does way less knockback and only gives like 5% extra damage for undead and 15% less, this needs to be fixed.
Weapons that don't have a upgraded 5* version
Simple and lazy fix for this: make them start at 3*/1 level later and increase their damage, you don't need to make new models for them or even add new recipes.
Vitasuit
Add a real line to this
Allow demos to place uncharged bombs
I don't know how this could be correctly balanced, but how about a limit of 3 bombs and you can't charge bombs while you have placed uncharged ones.
ASI for Bombs
this speeds the time up that a bomb needs to explode
but I don't want to imagine how annoying this is for gunners when you are fighting in a arena with mechaknights.
So you're not actually a gunner, but you're suggesting changes based on what you assume is happening?