[as-everybodymono] will let you do this hastur as blue_h3x says

Also [as-lessgrey] will change some greys to colours.
Also casual mono has a very high colour traffic density, i've seen some with 90%+ colour blocks.
No characters need buffs imo, games fine and fun as it is. No song is perfectly balanced for all characters, thats why people who give the game the time it deserves learn 'em all(eventually) And ofc newbie throne whores like me learn em all too
Mono is what it is and needs no changes to the basic game mechanic though, as i've mentioned allready in the thread, a scoring system that would create more variance in scores and would somewhat penalise those "gotta catch 'em all players" would be a welcome addition to people competing mono a mono(read: mano a mano

)
To quote my earlier suggestions:
My suggestions to add more skill to mono play but to keep the scores reasonable would be:
Remove the points you get for each block hit(leaving only match points)
Add a clear bonus for clear matches
Extend the chain time to allow more strategical chaining into high scoring parts of a song.
The clear bonus might sound silly to people who don't play mono frequently, but on occasion a block in a side lane could bring your points down or a poorly timed force clear could kill your clear bonus on a big match(ie. when you have 2 blocks very close to eachother and only room for 1 more where the second block is hit before the first gets added to the match and the blocks match off)