In all honesty I'm shocked because so far I have only found two sly cooper in equistria that are not dead there needs to be more!

I've found more than one instance of guile in equestria.

Discord. there are too few with him (of any substance) and mostly he is in one-shots even then.

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I'd like to see more Steven Universe characters in Equestria; mainly Lapis Lazuli.

4503517 I would love to see more Soundwave fics so far i've only found one

4503517 anything with digimon fusion cast.

ender-dragon
ender-man
herobrine
jesus

The New Cybermen

Alex Louis Armstrong

Atom (Astro Boy) and maybe his sister?

Pretty much any main character of The Slayers. Granted I helped with that a bit by doing one myself.

Jake Long, Danny Fenton, Max McGrath, Randy Cunningham, just to list some.

Jyggalag, and silver surfer!

4503517 Pokemon, because it hasn't been done before. Not even once.

All joking aside, Buffy the vampire slayer. Cell (dragonball z). Finn and jake from adventure time.

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Personally, I don't like this request. I mean, I can understand if you want to see someone do a character, but if you ask for more it loses it's originality and meaning. What would you do if, suddenly, everyone did a Sly Cooper fic?