The threads I've found that answered the questions were really /really/ old, so gotta ask again.
What are the best weapons for a quick and easy jelly king farm? Specifically for guns and swords. I appreciate any responses.
Best weps for jelly king farm?
It depends heavily on your star level and what you do have access to. Assuming you're stuck at 3*, you may want to bring:
Swords:
Brandish line (any variant, shadow may prove more useful)
[DLC] Stable Rocket Hammer
Guns:
Dark Chaingun
Tundrus
Bombs:
[DLC] Dark Reprisal Mk. II
That's pretty much the bread and butter for a quick royal jelly palace run. As a side note, the royal minis are for some reason slightly resistant to shadow damage, meaning an elemental weapon is actually better for taking them out. If you have extra weapon slots, consider an elemental side-weapon, otherwise stick purely to shadow since the royal minis aren't too terrible, and the only properly shadow resistant enemy in the palace are silkwings, which can still go down rather quickly to nightblade swings.
Additionally you may want to move this thread to the New Recruit subforum. Even if you've been around for a while, that subforum is primarily for asking for help or knowledge having to do with the game. :)
Just a dark chain gun really. It's kinda broken for RJP. One charge shot per stage of Jelly King is all you need from it.
Swords:
Acheron > Obsidian Edge (If you're struggling with the Jelly King's healing) > Rocket Hammer (See Fangel's response) > Combuster (Works just fine all around in JK)
Guns: Grim Repeater > Umbra Driver > Winter Grave (Charge Shot won't go/pierce and will be interrupted by Purple Royal Minis which are common)
Bombs: Dark Retribution > Venom Veiler > Shocking Salt Bomb
Dark Retribution or Salt Bomb. Bring DBB to deal with mini jellies and silkwings.
Night blade + Pulsar
*mic drop*