A easy to use Female Char.i guess Ashe fits the bill.Just get her Boots of swiftness -> B.F. Sword -> Zeal -> I.Edge -> Phantom -> Starks/Madreds (depending on situation) -> Black Cleaver and your golden.
for Miss Fortune I usually take a Pure AD build. zerker greaves -> Bloodthirster -> Last Whisper -> I.E. -> if your feeling to squishy Frozen Mallet/otherwise Madres Bloodrazor -> Black Cleaver (or if you feel like your enemies keep getting away,hexatech gunblade.the little AP bonus is nice for make it rain)
you dont need Attack Speed items with Miss Fortune due to her Impure shot active which at lvl5 adds 50% A.Speed
Personaly,my most used Char is Le Blanc.
Mejas soulstealer -> sorc shoes -> rabadons deathcap (at this stage i usually have 10-12 stacks on mejas and i rape face like its nobodies buissness.) -> morellos tome (nice cooldown and mana regen) or Deathfire grasp (if they got a lot of HP stackers) -> voidstaff -> banshees veil
with this build I can nuke every squishie in 2 seconds.Since the first attack silences them for 1.5 seconds they usually dont fight back.
Another super Char is Irelia,she is easy to use (exept for her ulti,which isnt auto aim,or shows a cone but fires off in the direction of your mouse pointer.But if used correctly you can AA one Enemy while using the Ulti on a creep wave to heal yourself.)
Get a Philo Stone -> Merc Threads -> Trinity Force (start with Sheen.Once you have it use her Q ability on creeps which usually kills them.If Q kills creep you gain 35 mana and skill refreshes.Q another creep that is at 3/4 life.Rinse and repeat.If done correctly you can kill a whole wave in 5 seconds giving you almost 350 gold.) after that I usually buy Tank items.Why? cuz her Hiten skill
adds 75 TRUE damage when active.thats like having a Black Cleaver for free.And since Irelia is a Hero that needs to get up close and personal HP is the way to go. -> Randuins Omen -> Shureilas Revenge and last but not least Atma's Impaler. this item likes to get overlooked but it can be very powerfull.It gives you armor (which is usefull against AD heros like Yi and Xin) and it adds 2% of max health to damage. That's another 60 Damage. You will have around 150 attack damage with this build (without Runes) plus the 75 True Damage,which gives you a whopping 225 Auto-Attack Damage. Her Ulti heals you for 20% Damage dealt and you can use it 4 times in a row,with a cooldown of 30 seconds at lvl 3.which gives you AMAZING lane sustainability. And no,enemies cant run away,due to her Bladesurge (Q) which has a cooldown of 6 seconds at lvl 5.But with the right items and masteries can be pushed down to 4.6 seconds
Tl;DR
Irela,Ashe and Le Blanc are really good female Heroes.
Added at: 00:40
Anybody out there wanna talk about items? I've pretty much got mine down pat, but wonder if anybody has suggestions. With Master Yi, I go
Chalice of Harmony -> Berserker's Greaves -> Infinity Edge -> Phantom Dancer -> The Black Cleaver -> Madred's Bloodrazor (or Stark's Fervor if there aren't any ridiculously high HP enemies around). Infinity Edge definitely seems to be the game changer for Yi.
I dont really know about Chalice of Harmony.It seems like a waste of Gold to me.Get Boots and maybe 2 Blue Pots.Once you reach lvl 6 you usually wont run out of mana.Unless your using a his Meditation ability a lot and if you are,your doing it wrong. Try to use his Wuju attack on the creep with the lowest HP nearest to you.You will usually Jump to the hero next if he is close enough. You then retreat.You just got gold and harassed the enemy.