Hey my name is Nemesis and this is my AD Leona build. In my opinion this build can be fairly OP if played correctly. This is my first build/guide so sorry if its not amazing. All criticism is welcome.

In my opinion these are possibly the best runes you could choose as they offer decent damage and defence but taking CD or AS quints also isn't a bad choice

The standard top combo, you may switch out teleport for ignite if you are confident you will win your lane.

By maxing out your W you are massively increasing your armor and magic resist early making you very hard to kill and giving you a higher chance of getting kills.

For your first item you will either get Hydra or Botrk, if you prefer quicker clear time and more aoe damage then go for the Hydra but your W provides a pretty quick clear anyway, otherwise go for the Botrk which is my personal favorite because it provides you with attack speed and its active which is very useful as it slows your target while speeding you up and also heals you for a small amount. As for the other items Ionian boots will provide you with you some cd which is very useful and the bloodthirstier provides you with a massive power spike and makes you very tough to kill. The 4th and 5th items being either the damage items which basically make you a carry or the tank items which make you even harder to kill and at this point you are basically invincible. And the last item being the Tri-Force which just makes you stronger in every single aspect.

At the start of the game just to farm up as much as possible and if the enemy champion gets close enough just q them and deal as much damage as possible while they are stunned then retreat back to your minions, doing this about 2-3 times should get them really low making flash, recall or maybe even securing you a kill. Continue this until level 6 when you should be able to secure kills very easily by simply using W-E-Q and ult when they are trying to get away, thanks to your ults range you should be able to slow/stun them even if they flash.

In a team fight try to aim for a whole team ult and then target squishy champions since you should be able to kill them quickly while they have a hard time killing you, your team should be able to deal with the rest.

Pros

High Damage
Lots of CC
High Life Steal
Nice Gap closer
Amazing In Teamfights
Lots of free Armor and MR from W

Cons

Not so good early
Takes a while until you get your damage
Can be hard to hit E/R in certain situations
Quite vulnerable when W is on Cooldown

So overall try to farm as much as possible Early, and then 1v1 anyone as soon as you get bloodthirster. (If anyone actually bothers to read this please tell me if you think this was useful at all and if i could improve anything everything is appreciated)