It's easy, if your avatar is a person, you have to talk like they would.

Ex: If it's Sora, you have to be upbeat and positive.

(And if it isn't a real character, than you can make up your own personality!)

I'll go first:

 

Iceland: I am NOT going to call you onii-chan.

And who are you? Another person pining after my senpai?

I like tacos y burritos

Where'd all the color in the world go? >  *runs angrily*

Your resolve is admirable. However, if you draw that blade...

I will show you how brittle those convictions really are. 

Do you think you can scare me? I know what keeps you up at night. If you wanna make this bloody, i've been itching for a fight.

Gil: Nien! (No!)
Lud: *cries louder*

I was just kidding. Sheesh.

I am in service to thine honor of war!

Oh really?

Aye milady, Thou shall require fidget spinners to calm yonder nerves? Shall it please thee?

Fidget spinners? I guess.

Nay, my fair lady you're going to doom us all!

Worst comes to worst, I've got this.

Uh, what?

You don't understand colossal wars shall rise and the countries are already in turmoil my lady, how will ariana grande reclaim the saliva smothered donuts??? The pastries are becoming relentless in attacking the human race. War shall wrought to thine knees!

What the hell are you talking about? You're making stupid crap up.

Indeed, I conjure great words of wisdom.

I am....now surprisingly hungry o_0....

Here, have this. *gives you a cupcake*

May I have a cup cake? My fair maiden?

Of course. *gives you one as well*