Natsu vs Charizard
Gray vs Glalie
Lucy vs Snorlax
Erza vs Pikachu
Happy vs Swellow
Who would win? For me it's: Natsu, Gray, Snorlax, Tie, Leaning towards Erza, and Swellow.
@GeneralVan: Not sure Snorlax could beat more that one of Lucy's better summons. Plus he is rather slow. He usually goes down after about 2 matches. Pikachu would last for a while but Erza would ultimately get the drop on him due to more battle prowess. Glalie gets stomped honestly. There is nothing in his arsenal that would do much against Grey. You would have done better with Lapras. Natsu vs Charizard
@UltimateHero0406: yeah, I was going to put Infernape instead of Charizard, but that would be downgrading really. I put Glalie instead of Lapras because he wins way more battles, but Gray wins either way. Snorlax would really have to beat Aquarius, Taurus, and Virgo and the rest would be cake for him, Happy vs Swellow is a mismatch as Happy has nothing to offer Swellow, and yeah Erza vs Pikachu would be even but Erza would win eventually, she has a bit more Stamina than Pikachu.
@GeneralVan: Infernape's blaze power is serious business. Also, if you allow movie feats, Charizard becomes legendary level since he beat an Articuno and put up a fight against Entei. And Pikachu did battle a Latios to a draw so he has some muscle but yeah Erza packs more of a punch.
Team FT wins...
So overall, Fairy Tail wins.