What do you want to see in LoL?

So...a pubstomper?

Not quite.
High risk - Easy to stop, easy to gank, incredibly easy to knock out of course.
High skill - A bad player will be meh but a good player can play him 10 times more effecient.
High reward - If nothing goes wrong and you play flawlessly/Your enemies don't abuse the weaknesses you have, you will be a giant threat.

A hero where how you use the skills is what he is all about, you are rewarded massively for being good.

I see you haven't played Fizz: snowballs hard if you succeed early on, fails spectacularly if you don't.

Shadow Fiend also looks like he plays like AD Kennen with SotO and/or BT.

I have played fizz.
Shadow fiend and fizz are nothing alike and fizz is no where near the same kind of risk vs reward that a shadow fiend is.
A bad start for a shadow fiend is crippling, and it's a lot harder to have that good start with him due to certain items in DotA.
The best shadow fiend player in the world quit DotA competitively for quite a bit after a certain item was introduced that simply made shadow fiend a lot worse in competitive games and made it way too easy to stop his good early game.

I guess Invoker is a good example of high skill - high reward whilst lacking the high risk, which i don't like personally.

And SF has nothing like a kennen does :p

Just to make it clear: I don't want LoL to become just like DotA, i enjoy both games for their differences, i just miss some things.