By the way, now that the brainrot is getting sparked again, I have two possible backstory ideas for Mas, how he ended up being so influential, yet such a coward and obedient, plus greedy for power individual.
In the first scenario, Mas grows up in a very rich noble family, and he grows up sheltered, with a very conservative and greedy father, and a docile mother that follows her husband's beliefs. He is not allowed to make friends other than kids his status, or behave outside of the etiquette the rich follow. He does not develop like an average child. He has a phase where he rebels, but gets grounded for it. At a point in his life when he's still young, he gets to know an adviser from Coruscant who becomes his mentor and inspiration to get into politics. He moves to Coruscant, leaving his rather unpleasant past behind him, and starts his journey as a young Senator representing his home planet that voted for him and his justice oriented values. But as time progressed, his unresolved trauma became his shadow and started acting as corrupted as his father was, believing he was right at the end, and decided that the only way to thrive is to leave idealism behind, be cynical and always do what's best for your skin. Around that time, he met Palatine, who looked like his perfect opportunity to get behind a patron, as long as he'd blindly follow him. I had actually started writing this story, you might have come across it, but I would totally do some changes to it, especially the more accurate representation of Champala.
More recently I have had another such scenario in my mind, which is quite opposite of the first. In this one, Mas grows up in a poor neighborhood in Tidros. A rare kind of neighborhood, especially because Champala is such a just planet, but every place has its sewer. His single mother raised him (I'm contemplating whether I should give him siblings or not). She was working as much as she could to ensure they could survive, and as a result, she never spent much time with her son. Mas started spending a lot of time in the streets as soon as he developed his lungs and limbs, and met with the other few street rats of his neighbourhood, creating something like a gang. The more he aged, the more rebellious he turned, spending a lot of nights partying long, getting game due to his tall horns which people loved seeing, vandalising and sabotaging richer people's properties whenever he found the opportunity to do so. At a point he started getting interested in activism and making his voice stand out for the political rights of people his class. To get the attention of the higher ups, he thought of a plan to sabotage the tourism of Tidros and create a viscous cycle of a destroyed economy in the capital city. To achieve that, he gained the trust of some thugs on and off world, to cut out the supplies going to hotels, beach bars, cruise ships, restaurants, or even sabotaging flights to Champala. During that time he was managing most of the operation and it felt good being recognised and a leader, being in control. Which ironically transformed him into the very thing he swore to destroy, a mindless rich man in the later years of his life, when he exploited the power and recognition he gained during his services to justice.
I honestly can't decide which one I like the most