All messages (except debug messages) can now use MiniMessage formatting in addition to legacy color/formatting codes like &c (red). Some things like coloring the shadow of your text isn't possible in Minecraft, as this is handled client side, but you can now use all 16.7M colors in the RGB spectrum, add hover text to your messages, execute commands when someone clicks them and much more!
Messages sent to players may now also contain PAPI placeholders to show your players additional information like.... the current date and time for example (hover text):
BodyHealth's default messages are still formatted using legacy codes due to them being much shorter.