They do not have extraordinary martial arts skills, and they have never wanted to become top masters.
What they are proficient in are: stealing, traps, hidden weapons, detoxification, ventriloquism, disguise, swimming...
They rely on these extraordinary abilities to overcome obstacles in the rivers and lakes, turning rivers and seas into trouble.
They advocate freedom, go their own way, and only do what they want to do.
Use theft to make theft, and you have no regrets. They don't care about the means, only the results.
They are aliens in people's eyes, but they never care what others think.
This is the band of alien thieves.
A group of people who are looked down upon by a group of righteous people, but hated by the underworld people.