IC doesn't have as strict a meta as LoL, but there are some comparisons. Overall the gameplay is much closer to LoL than Dota or other mobas.

Roles: Enforcer - Pure tanks. Brawler - These guys have a bit of a balance between damage and health. Assassins - Very high melee damage, but also very squishy Marksman - Equivalent to an ADC in League. High ranged damage primarily from auto attacks. Specialise in dealing attack damage. Blaster - Equivalent to an APC in League. High (usually ranged) damage primarily from skills. Specialise in dealing power damage. Controller - Equivalent to a support. Most of their abilities are used for helping others/setting up kills rather than dealing raw damage.

I've heard the most effective team composition for Coast City is a tanky top laner (either enforcer or brawler), with either a marksman or blaster + controller in the bottom lane. You then have two junglers, one in the top of the jungle, the other taking the bottom and pairing up from time to time for ganks. For the junglers you will usually have at least one assassin, often two, but you might also have a brawler or a marksman/blaster.

But like I said, the meta isn't as strict and you will rarely see this team comp. Other comps include: * 3 top/2 bot - a bit of a nooby comp but it happens, especially when you first start playing. Usually at least one ranged and one melee in each lane, plus someone else. * 3 bot/2 top - same as above, just switched lanes * 2 top/2 bot/1 jungle - same as above with one melee, one ranged per lane and usually an assasin or brawler jungler - this is probably the most common team comp in my experience

Champions:
I haven't found any champions that are direct clones of League champions, but there are some abilities here and there.
* Atrocitus can be compared to Renekton in that he uses rage rather than will (mana) and it works in the same way as Reneks in that if you have more than 50 rage you can empower his next non-ult ability. However his abilities otherwise are completely different. * Shazam creates a field of lightning around himself that deals damage over time, like Kennen. * Aquaman can throw his trident like Nidalee can throw her spear. Just like Nidalee, his spear does more damage the further it travels before hitting the target. * Aquaman's E works like Renektons E. You dash forward, through targets and deal damage to anyone in your path. If you hit anyone, you can activate the skill again within 4 seconds. * Aquaman's ultimate also works kinda like Heimerdingers, in that it empowers the next basic ability you use, but the abilities are completely different to Heimys.

I'm sure there are more direct comparisons, if I find any I'll update this.