What is important in game in my opinion should be in a bright light colour with good contrast to the surrounding. Less important messages in darker less contrast colours.
We have purple for admin and castle owners as well if i am not mistaken for the new mysterious bonus which no one knows for sure what it is
The admin messages are important as it gets so a brighter version going into pink would be ok(even if i dont like that colour
)
The entering of castles owner is a site note, not that important in crpg, dark purple or a complete other colour then the admin chat.
The new mysterious message should get its own colour perhaps orange and
as in fight we miss sometimes what is in the chat, it would be really nice to have a note about that on characters account. Perhaps an additional tab which collects RPG style messages and defines somehow our character as well.
Kills and deaths are a site note, they are spammed in the chat and they aren't at all important to read, if you want to know it you go into the log and can reread it.
dark red and dark green instead of the light red and green.
Messages from your team mates can hold important tactical messages,
make it a bright light colour which has a good contrast to the surrounding.
So perhaps a light blue then.
-----------------------
Whatever colour you implement, the more import the message/chat is the brighter it should be standing out in contrast. The less important the darker without disturbing us from our fights.
-----------------------