I've seen several servers that have multicolor titles with different hex codes. I'm not to sure if the plugin they use is better chat or custom. If it is better chat please explain how I can do this. Thanks, ch1ck3n

You can add multiple color codes to your title manually.
For that use [#HEX]Letter[/#] or in case that does not work, the game specific tags. For rust that'd be <color=#HEX>Letter</color>