Any mods out there that lets the members have there own font, size and colour for every post so they don't have to change it all the time? So they can set there style and just change it whenever they want to
I've never heard of this but you can add custom font using this plugin:
http://mods.mybb.com/view-resource/custom-font. I doubt there is other choice but adding some used and known fonts and they are able to use BB codes for their own font.
This should probably be in the plugin request forum.
I like the idea of a plugin which allows each user to specify default BB Code to pre-populate each post.
Besides having a server-sided plugin, you could have a client-side add-on that applies the styling onClick of "Post Reply".
That would be easier unless someone makes this plugin.