Me and PressMe were thinking up a boss idea.
"Captain One-eyed Pete".
He would spawn on a flying ship in the middle of the room that's accessible by the fourth teleporter. The ship would have jets and stuff on it to make it fit in more.
The boss would have a regular amount of health for a boss, and have a hook hand.
His main weapons are his claw attack, which has a really short range but it makes up for doing a lot of damage and flinging players back, his Cutlass which deals sweet blows and is a fast attack, and his Hand Cannon which is a gun that is slow, but it shoots cannonballs (PressMe said he could make something like this).
His secondary item is a bottle of rum which increases his damage dealt and speed, but his health gradually drains for a short period (1 minute) and if 10% of damage is dealt to him during the duration, he tumbles for a second.