Xbox One, gets green.
PS4, gets blue.
Switch, gets red.

Just to show that we're console players and that we cannot properly communicate with PC players. There are times I get text messages that I cannot respond to properly at all so giving them the knowledge that I'm a Console player will let them know I cannot talk to them well.

Also this will help with trading roles if I get autofilled to a role I suck candy canes at.
The message "I'd like to play Support" or just add "Mid" or "Carry" doesn't really drive the point towards other players.
It will help to say that I'm very bad at that role also the chat should show my win rate on that role so if show my jungle win rate of 48% people will go "ffs my jungler is trash" and may consider giving em the role I'm strongest at.