Granted, but you don't have a spacesuit, any source of oxygen and you're stuck there, so you can't come back to earth...

I wish I had an elder brother...

Granted. He is at the graveyard. Hope you like your brother!

I wish I could understand/talk to animals

Granted, but now you don't understand the human language and can't talk to them!!

I wish I was a ninja.

Granted! But your now a fugitive too actually that sounds kinda fun

I wish I actually liked math...

Yep it does
Granted, but you just like it and you're still not good at it...

I wish I could get an ouija board...

Granted, but you don't know how to use it...

I wish we could launch an attack on the earthlings soon....

Granted, but your our mission fails and we're conquered by the earthlings instead...

I wish I could send Voldie an owl asking him to get a nose job and hair transplant

Granted! But he turns you into a death eater
I wish I could start as a baby with all my knowledge of right now.

Granted! But you can never get anymore knowledge. Your brain can’t change!!

I wish I could have unlimited food supplies...

Granted but you can never do anything else

I wish to be an actress