MMMOOOOOOOOOOOooooooooooo! And what's more...
... than glue
Jeremy, Aelita, Odd, Yumi, and Ulrich were friends, and most people couldn't get it. Some even resented it. Aelita, they could almost understand; Jeremy had discovered her programming, saved her from Xana, and got her her own body. But Jeremy had known Odd and the rest from before all of this mess going on in the world had even come out in the open. There was also the fact that a lot of the newer members of Lyoko probably would not recognize Jeremy for who he was if they saw him. He was just the nerdy kid who never went out to fight Xana's monsters and, recently android/cyborgs.
Of course, those who did know Jeremy before everything hit the fan were the ones who were resentful. Odd, Ulrich, and Yumi, along with William, were their best fighters. Aelita was metaphorically, and literally, their anti-Xana; their techno-genderbender-Jesus. There was no reason why they should grace that loser with their presence and ignore the more important people, (like Sissy).
But, even so, the group remained a group, though the dynamic had shifted.
Or would it be until the dynamic shifted, because they didn't really hang out as much as they used to. It wasn't the normal drifting that came with life, but a series of abrupt catalysts that happened one after another. And really, when one got right down to it, their entire friendship was never something that would have happened naturally.
