Pure Paladin Squad

The Seirin group is a team of versitile hunters that the late Chairman Netero onced belong to, the members are so skilled that it is considered by other hunters as legendary. There's not much is known about it's other members except that the group is likely to be already disbanded.

Teradain Neutral, Bushidora Ambitious, and Lupe Highland made an attempt to reform the Seirin Group during the 13th Hunter chairman election until the former two was killed by Hisoka. Morel McCarnathy told them off that they're too weak to even claim the name of the group.

Original Members
Netero - was the 12th chairman of the Hunters Association and was once considered the strongest Nen user in the world during his prime.

Reference

 * 1) Hunter x Hunter Manga Chapter 329