Based on the lore for what was given for Viper, it seems that it’s a tribal hunter, but in a sense it is more akin to being a cold-blooded killer. This makes it seem like an assassin-type job, since it shares Scouting gear with Ninja.

In real life, Ninja were actually spies and assassins that were hired by wealthy families to infiltrate places. During the day, the would-be Ninja were farmers. Most of a Ninja’s toolkit in real life were practical tools, including some sets used by farmers like the ball and chain attached to a sickle (like Kohaku from InuYasha). At night is when the “farmers” would go about their nighttime jobs as a Ninja to spy and/or assassinate their targets (usually high profile people).

I believe that Viper will follow a similar path. The NPC will possibly be someone from Tural, most likely a Mamool Ja as the name Viper can also be based on them being part reptilian beastmen.