I don't really like scaling HP, my bro asked me about it, i bought them, tested and i like to spam Q more than lategame tankyness

You should consider scaling hp zeals over mp5, Diana isnt mana dependent enough for going mp5 zeals in my point of view.
Just an suggestion, you're decision.

1)Your guide offers no clarity on the reasons as to why you choose what you did.
2)How do you jungle with 21/0/9 masteries?
3)Give me reasons as to why it would be better than a Diana who has 0/21/9 masteries.(even then I doubt it would be good enough of a reason)
4)NO Wriggle's Lantern?
5)Your Jungle masteries are terrible instead of focusing on damage you should focus on armor with Greater Seal of Armor and Greater Glyph of Scaling Magic Resist
5)If you dont know how to jungle please dont add a jungle section to your guide its frustrating to see something like this
6)Needs more in-depth and more colors to make it easier to read.
7)You need more sustain in lane I suggest going for chalice
8)Overall I believe you need more experience before you can call this guide complete

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You know that people go jungle sometimes triple gp5 cuz her basestats are HUGE??

u need more ability power for a better build

................ ofc you take pots... and kage's cause i like play roaming diana due to her good ganking. and u say cause shield GA wortless when you'r melee?....

No health pots to start? Kages Pick as first item? If you're midding you don't need extra gold. Also, Diana has enough sustain with her W that a Guardians at the end isn't necessary.