|The following section contains Webcomic spoilers. You have been warned, manga-only readers.|
The Neo Heroes (ネオヒーローズ, Neohīrōzu) is the new hero group established by the Hunters, Raiden and other superpowered individuals to replace the current Hero Association, which they deem to be corrupt and care only about wealth and reputation, not the people.
Unlike the Hero Association, the Neo Heroes recruits members through a special headhunting system rather than a physical and written test. There are more than 2000 candidates in the Neo Heroes, which is larger than the 600 pro heroes of the Hero Association. Furthermore, the organization seems to know the shortcomings of the current Hero Association in term of corruption, unfair treatment of hero members, as well as collateral damages often caused (some S-class heroes, especially Tatsumaki, often causes massive property damage during their fights) in order to build the better hero organization.
So far, they have recruited a handful of S-Class heroes to join their organization. According to the Neo Heroes recruiter, they promise to treat heroes much fairer than the current Hero Association, however their headhunting system is as biased as the conventional test in the Hero Association since they only focus mostly on designation of the S-Class, rather than the others heroes in the lower class, which indicates why they didn't try to recruit Saitama, mostly because of his ranking.
When referring to members, they don't call their members Pro Heroes, but rather Neo Heroes.