right now i really enjoy all roles except adc, have 6300 ip and am looking to get a new champion/main a role. What are the pros and cons of each role with these champions.
TOP:
for the outplay
for the sustain
JUNGLE:
for the ganks/blobs r neat
because one shots are fun
MID:
ballz 
ballz
SUPPORT:
tanks counter assasin meta 
tank as well
p.s. how would you rank these champions for fun, how well they do their role and meta.
Irelia is alot of fun, has potential and is a well rounded champion. Also comes with a dash. Zac is my recommended. Rengar is hella fun if you can get ahead, but hella frustrating if you get behind. Syndra is better imo for working on skill cap, juggling abilities that interact. Higher range as well. I dont agree with your picks for support, but I personally prefer leona. Allist just got changed so I cant tell you alot.
TOP: No matter who you play, there's always the problem of being camped, which is the top lane special. There's nowhere to run to if you get dove under tower, so there's an all-round con. Irelia has great sustain and is very powerful when she has triforce, but can still be squishy and kited before that. Trundle is a great duelist, but he doesn't do too well against ranged champions, and he has no definite sticking power, aside from a well-placed pillar and W.
Jungle: Zac is strong, but needs team cooperation to work. Rengar is strong and can one-shot people, but is only good at that, and not very effective in teamfights unless you get really ahead.
Mid: Ahri is good, has good mobility, and AP-scaling true damage to supplement her weak overall burst damage. Can be easy to fuck up CSing with her, though. Syndra has less mobility but a very safe laning phase and strong burst overall. Really strong pick, actually.
Support: Alistar and Leona are pretty much the same, being CC-heavy beasts. They can be kited out with ranged champions, but their engage is quite good. No real cons, afaik.
They're all very fun, imo.
I would recommend you try sona support. I dont mean Sona "support" i mean real support. It is actually quite fun, and people don't expect a utility tank sona.
I think you should play 
, they are all in your favourite role.
