The Mediterranean Branch
The Chimera Corps has existed for hundreds of years, going back to the days of Ancient Greece, where it originated. While the organization has spread all over the world, its Mediterranean Branch is the oldest and one of the most powerful due to its influence on the others. Despite this, the branch has always been run in a different way compared to the rest.
The first difference is its prioritization. When the organization was first created, the Assault, Observation, and Research Groups all shared common goals and worked together to achieve them. As time went on, the Observation Group became the main priority, as gaining and controlling information allowed for them to manipulate others with relative ease. The Assault Group became the branch's enforcers, with its Heads varying between honorable leaders and bloodthirsty maniacs. Meanwhile, the Research Group was simply used by both to create and modify weapons and equipment for them, as well as selling their creations to fund the branch and expand its influence.
Today, things within the branch remain the same. The Assault Head, Korina Mariadi, spends more time training, fighting, and prioritizing her own interests than acting as a leader. Her predecessor and role model, Myrto Kyriakos, behaved similarly, though at least Korina cares about the actions of her subordinates and goes through the effort of keeping them in line.
Within the Observation Group, the previous Heads have spent as much time keeping the Assault Group under control as they have influencing and managing things in their region. The same applies to the current Head, Stephanie Johnston, who has the unfortunate task of overseeing Korina and managing her own group.
The Research Group is mostly under the radar, typically focusing on their current projects more than any external conflicts. By now, the only time the group is heard from is when they're releasing a new or improved creation, especially when it's for the Assault Group. So little is heard from them that even their current Head is unknown, with the only sign they even have one being the communication that privately happens between them and the other Heads.
Other Details:
In order to consistently train and recruit new members, the Assault Group owns and runs many gyms and dojos throughout the Mediterranean Region. By now, any they don't own are likely connected to them.
While the Assault Group has its fair share of mercenaries, assassins, and other hired muscle like the other branches, most of its members are fighters and martial arts that joined or are associated with the group. This is due to their presence in the underground fighting circuits throughout the region, as many were established and run by previous members and associates of the group.
The Research Group of this branch mostly focuses on augmentations through the creation of serums and cybernetics. The current Heads of the other two groups have both benefitted from this.
Due to the actions of Myrto Kyriakos, mixed martial arts have gained more popularity throughout the region, especially in underground circuits. After she was replaced by Korina, she moved to Thesaloniki, Greece to create her own MMA gym, which she devotes most of her time to now.
The previous Observation Head seemingly disappeared after his retirement, as he decided to avoid being followed entirely. The only connection to him that even his own subordinates are aware of is that the Observation Head of the North American Branch is his grandson.
Two of the other most powerful branches in the Chimera Corps are the North American Branch and the East Asian Branch. While there hasn't been much communication between the three, each one has control over their neighboring branches to varying degrees.