Swordtail was employed as a construction worker under Grasshopper until he became a fugitive with Blue and Cricket. He was simultaneously a member of the Cicada Hive Chrysalis.

Luna and Swordtail have a female dragonet named Meridian, whom they care and love for deeply
He currently is in a long-standing relationship with Luna.
Despite having very different personalities, Luna cares about her younger half-brother
Luna is in a relationship with Swordtail and cares a lot about him