Jungle Nunu, Carry Ashe, Tank Singed, Mage Ryze, and Support Soraka

Five .. hmmm

Shen as my tank
Nocturne for 3v3
Anivia as my mage
Gragas for the Chaos the ult causes
I would love to say Vayne but I haven't mastered her yet ... so I will go with Ashe (or is it Amumu) anyway .. a 5th ...

I need to find a good laning partner for my friend's Vayne in 5s .... or simply a support toon ... hmmm

Kayle - Amazing Support or DPS.
Karma - I like the Mantra Mechanic
Cho - Just my go-to tank
Eve - stealth is fun
A second Kayle

If I was forced to pick 5 then I would try to fill every category as best as I could. I am assuming that "competitively" means a ranked game....so that involves a draft. Meaning, picking Shen or amumu as my tank would be a waste lol.

Ad: Ashe
Ap: Anivia
Jungle: Trundle
Tank: Galio (I think he's super underrated)
Support: Janna

go for tanks people almost always need tanks and if u go offense they can carry
Mao- crazy combo
Cho- jungle, lane, tons of health a good champ
Amumu- if u get good with him he can destroy a team
Rammus- will always be op against ad characters
Taric- if u want to go straight tank

Morde
Morde
Morde
Morde
Morde

MORDE ES #1 HUEHUEHUEHUE

Irelia: i just love her when released and i can easy build her as a assasin / carry / tanky dps

Kassadin: hes my first champ i still loving him but i think hes a bit nerfed anyway hes a awesome caster

Malphite: my only "well-used" [ xD ] tank and the only tank i can play without fail ._.

Twisted Fate: a awesome ranged dps and BD ( anyway i dont like him so much... )

Nocturne: nice jungle a epic ganker and my lovely annoying main assasin

So either i play terrible champs, or I'm unique..ish cause i didnt see them in here much

Teemo: My "main". AD, love the map control and ad lock down with blind/exhaust
Kat: Closest i can come to an ap carry, I just don't feel the mages
Xin: I like him as a melee carry more than a tanky dps
Nasus: Tanky dps yes. However i mostly end up playing him as a full tank and do better than when i try rammus/shen. I'm just bad at tanks i suppose

Nocturn: I only really play 4, but I'm saving up for Noc as I'm hoping to add him in as my jungler...maybe replace xin

warwick
ashe
malphite
shen
lux

you need a:

jungler - yi
tank - shen
AD melee - xin/yi
AD ranged - ashe
mage - leblanc

are what i use