I am making this guide because i personally like Hybrid Yi, i tried him, and first time i went 17 and 1 and thats pretty good, I'm level 30, so its not because we were going against noobs. This is my first guys By the way. Anyways i hear so much about Ap yi being bad, which i completly disagree, Ap Yi is great in team fights and can heal a lot of health. But late game, all you really have is your Q, so i thought why not build Hybrid, but mostly focus AD, and thats what i did. (Build still a work in Progress)

*Farm, Farm, Farm. You need a lot of farm early game, which is where Ap come in handy, you can use Alpha strike a lot, but you can run OOM really easy if you are not careful.

*Poke with Alpha Strike....it works

*Save your ult most of the time to get away, unless say you are getting a tower, or maybe dragon

*Don't get really cocky early game

*Backdoor Yi late-game is good if you have the opportunity, just watch the map for people coming to kill and/or gank you.

*You can somewhat tank some hits due to your w when you have a rabadons cap, but don't 1 v 5

*Can tower dive pretty well and live

Pros

-Great Lane sustain
-Good poker
-Just great in general
-Can really do some damage

Cons
-If enemy team has a lot of CC, its hard to play well
-Not the best against teemo and fiora, but you can win

The reason for these runes is well good early game, which will end with a good late game, more than likely of course.

well the reason is, not every items great on yi, and yi has no CC, and those are some of the best items so yeah :D

I give you a choice of good items, but personally i like 2 phantoms and 2 Blood Thirsters. But replacing 1 Blood Thirster with a Infinity Edge is not a bad idea either.

*Personally haven't really tested hextech Gunblade, but its a great Hybrid item

Personally i like flash and teleport, flash is good to get away, teleport for split pushing and stuff like that. Ignite wouldn't be bad either, ghost could help but not needed because ult. but pretty much any other spell, don't use

That's really all for now, a quick guide, its still a work in progress so it will be updated in the future, If you do well send me a message or something, or a video, whatevers cool, Bye :D