SimpleNameColor-PMMP is a port from a plugin that I created in 2014 for Bukkit (link here) . It's a simple, straight to the point, no bullshit plugin. All you need is to add the permission to the player/group and they will have custom colored name in chat.

This plugin IS NOT aimed towards people who want to customize everything in the chat. Its intended purpose is to keep Minecraft's original chatting style but with colors (got this idea from MCPVP back in the days).

It also probably conflicts with other plugins that change the format of player chat, so be careful.

Color reference

Permissions

Permission Function

simplenamecolor.aqua Aqua

simplenamecolor.black Black

simplenamecolor.blue Blue

simplenamecolor.bold Bold

simplenamecolor.darkaqua Dark aqua

simplenamecolor.darkblue Dark blue

simplenamecolor.darkgray Dark gray

simplenamecolor.darkgreen Dark green

simplenamecolor.darkpurple Dark purple

simplenamecolor.darkred Dark red

simplenamecolor.gold Gold

simplenamecolor.gray Gray

simplenamecolor.green Green

simplenamecolor.italic Italic

simplenamecolor.lightpurple Light purple

simplenamecolor.obfuscated Obfuscated

simplenamecolor.red Red

simplenamecolor.strikethrough Strikethrough

simplenamecolor.underline Underline

simplenamecolor.yellow Yellow

simplenamecolor.white White

Known issues:

Strikethrough and underline doesn't seem to work. Perhaps it's a limitation from the game itself.