This plugin shows the current percentage hp of given NPC's. The plugin remembers the HP when the NPC doesn't have a HP bar shown. The plugin allows you to change the location, the Font-type and Font-size of the shown percentage. It can also change collor when a certain low HP threshold is met.
Nightfirecat/MonsterHP
Show the current monster hp based on either percentage remaining or current hp
JavaBSD-2-Clause