Here are some champions that I find become an incredible asset to any team if you know what you're doing.
Swain. (amazing snare if you can land it, and a crazy slow that most people are too stupid to get out of range of)
Karma. (the only support with a shield and a heal both on a low cooldown)
Irelia. (if farmed properly she can tank, she can carry, or she could do both at the same time)
This one is kind of iffy, but
Cassiopeia. (I've been playing her a lot lately, and from my experience she seems to be able to carry the team early game, then turn into a kind of support caster late game. With a Rylai's combined with her
Petrifying Gaze and
Miasma she can pump out TONS of cc if you can land your skills)
Singed. (can take on whole teams by himself if farmed up/fed enough)
Ashe. (only thing making her viable is her utility, but her ultimate can win games)
Lux. (I've probably played about 600+ games with this lady of light, and I can personally say she can carry/support her entire team if played right)
I want to say
Akali, but she's just shut down so easily if people buy oracles/get resistances. Most of these champions you have to be really good at landing skill shots, and if you can you'll destroy. Anyway those are just some of my recommendations!



This one is kind of iffy, but






I want to say

Well I recently told a few people this so Here's DuffTime's list.
AP Burst;
Gragas
Brand
AP sustained DPS;
Ryze
Karthus
AD carry;
Kog Maw
Vayne
Caitlyn
Support;
Taric
Alistar
Janna
Sona
(All supports are fine, Sona and Janna are excellent.)
Offtanks/Tanky DPS for lane;
Cho
Olaf
Sion
Full tanks;
Singed
Cho
Galio
Good junglers
Amumu
Nocturne
Udyr
Cho
Trundle
This is not to say other champions are not very good, these are just the ones who seem to stand out in my eyes.
They are all strong at every point in the game if you use their kits correctly, leading to a strong comp which is weak at no point in time.
AP Burst;
Gragas
Brand
AP sustained DPS;
Ryze
Karthus
AD carry;
Kog Maw
Vayne
Caitlyn
Support;
Taric
Alistar
Janna
Sona
(All supports are fine, Sona and Janna are excellent.)
Offtanks/Tanky DPS for lane;
Cho
Olaf
Sion
Full tanks;
Singed
Cho
Galio
Good junglers
Amumu
Nocturne
Udyr
Cho
Trundle
This is not to say other champions are not very good, these are just the ones who seem to stand out in my eyes.
They are all strong at every point in the game if you use their kits correctly, leading to a strong comp which is weak at no point in time.

http://www.mobafire.com/league-of-legends/build/duffs-336706
Come hang out when I'm streaming! http://www.twitch.tv/dufftime
What I think are top picks...
Lee Sin - Your everyday xaolin ninja
Irelia - Your jack of all trades; she can initiate, soak, cc, snowball, carry, burst, dps, everything when used properly.
Caitlyn - Subject to nerfs
Morgana - Still viewed as a pretty ridiculous champion just because she can multi-slow/stun.
Other potential choices:
Graves - Subject to nerfs later
Rammus - Recent buffs were very nice, very good against teams are built around an MVP (like Twisted Fate, or non-'double AP' comps)
Taric - Tanky Support is a solid purchase
Fiddlesticks - Top class debuff mage / jungler
Urgot - Hard counters traditional ranged AD - your best back-up niche pick if you're the carry-player and the enemy's got the best normal ranged-carry.
Karthus - The deathsinger is good against everyone -
Death Defied too good




Other potential choices:







~ Gentlemen Cho'Gath ~ |
┌──┠┴──┴ < ಠ,....,ರೃ> |
~ Keeping this sig classy ~ |
The DevTracker - For all of LoL's latest developments! | Spongebob Squarepants - The Pride of Bikini Bottom
Guides of Mine - Click the... Eh... Come back later
~Undergoing barbaric-Destruction, tasteful-Renovation, and blasphemous-Reconstruction soonâ„¢~
(╯°□°)╯︵ â”»â”â”» | ┬──┬ ノ( ゜-゜ノ) |
3 for each roles, possibly the most versatile
Ranged AD:
Caitlyn(damage),
Ashe(initiation),
Kog'Maw (tank eraser)
Jungle:
Udyr(ganking),
Warwick(initiation),
Amumu (initiation-tank)
Solo Top:
Singed (team disruption and initiation),
Irelia (burst),
Nasus (farmer Pusher)
AP carry:
Morgana (utility-initiation),
Brand (damage),
Malzahar (anti tank-pusher)
Support:
Janna (utility),
Alistar (initiation),
Taric (stun-tankyness)
Obviusly there are other possibilities, but these 15 grant you to always have 1 champ available for any role.
My suggestion is to give emphasis to the champs I labeled as initiation, as a team with no initiation (expecially in solo Q) can't pick it's own teamfights.
Ranged AD:



Jungle:



Solo Top:



AP carry:



Support:



Obviusly there are other possibilities, but these 15 grant you to always have 1 champ available for any role.
My suggestion is to give emphasis to the champs I labeled as initiation, as a team with no initiation (expecially in solo Q) can't pick it's own teamfights.
MrNicholas wrote:
Here are some champions that I find become an incredible asset to any team if you know what you're doing.



This one is kind of iffy, but






I want to say

whats funny is about half of those champs are relatively useless in the competitive scene
You need to log in before commenting.
<Veteran>