Homicidal Liu
1) Tease him about being a bad boy
2) Cut his hair
3) Draw stitches all over yourself and shout "we look exactly the same!!!"
4) Grab his cheeks and pull on them while expecting face then flick his forehead and skip away (me: Oh... My... God... You are so... FABULOUS!)
5) Grab his cheeks (again) and shout "SULLY WHERE THE HELL ARE YOU!?"
6) Wrap him in a really, reaaaally long scarf.
7) Call him prison reject (good god T^T)
8) While he's asleep dress him up as Jake (adventure time), grab a rubber sword and scream "LETS BE OFF TO PRINCESS BUBBLEGUM!"
9) start sewing and sing "In goes the needle, out goes the needle to see things together~~~~ just like Liu face~~~~!"
10) Sing "His name is Liu Woods! He's a mur-mur-murderer!~~~" sing in the style of Roomies "His name is Pewdiepie!")

Herobrine
1) Destroy the pyramids of sand
2) When all the leaves disappear, replace them with dyed clay
3) Draw him in a very unflattering way
4) show him clip after clip of Minecraft songs
5) Once you can't find anymore of the songs, refuse to let him go and sing them really loudly
6) Keep calling him Steve
7) Call him egg white eyes
8) Flick him, giggle then go away for a bit and then keep coming back and repeating the same thing.
9) When you see him shout "My anaconda don't want none unless you got buns, hun!"
10) Following number nine press 'shift' a few times to do the weird twerk-ry type the while shouting it and turn your backside towards him.
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I had no idea what to write. Sorry If they suck!