A floater is an individual who cannot pin-point what group they belong to. They walk down the halls and get nods or smiles from anyone in any group. They are normally polite and friendly but shy. A floater generally becomes a floater because of failed friendships not through fights but through "drifting" apart. Hence, the name floater. They don't like sharing their personal business so it is very rare a person will get inside and actually stick around. Floaters are known to be kind of sketchy because of this. But as previously noted, they are generally polite, friendly and due to the enormous amounts of nods, waves and gestures they get in a day, they usually have a great smile.
Bob: Hey I saw *blank* today. Jeez that guy is friends with everyone!
Ted: No, he's just a floater, we used to be friends... I don't even know what happened there...
Bob: But what a great smile.
Ted: That's for sure.