this is based off of something my friend and i made up on facebook on chat where but this is a bigger way with more people can join i will be replying because i have some ideas that will probably win and if you beat these i will congratulate you on it (if you want you can use these rules on a facebook chat i give you full permission)
rules: the person puts in a character or person/people to use
the next person puts in a somebody who you think can beat them
you can use objects (like tanks or things like that) as long as you have a person/people with it
in order to win you have to make one that can go two days without another person finding one that can beat the other

example:
first person
sormtrooper with a gun
second person
a rebel soldier with a tank

i'll start with an easy one
Gir (from Invader Zim)