The emojis are so funny. I don't know how you all do that!
Some of the emoticons are available on site and you should be able to see them by clicking on this icon above the post box:

Some of them that I've used here are ones I've saved onto my computer to add when the BYC default ones just aren't the right expression for the situation.

As for your other questions, I'll leave those for others who have a better idea of what to do in that situation. I don't keep my cockerels with my pullets once they've started to mature, so I don't have much experience with that. My only recommendation there is to have a cage or two ready to separate them if those boys start to be too much for each other or the pullets, just in case.
Also, I would say based on your profile pic that you have Splashes, yes.
