So am I... I'm about to make my first cupcake next week
- Do not kill, unless you see him kill.
- Be kind, to everyone, even the enemies.
- Try to be courteous.
- Finish your heists with the most amount of money possible.
- Flirt with him (He will always brush it off, but it'll help)
Well, I can tell you that, there will be a scene in the end that involves the MC baking cupcakes. If you can't.. Gabriel will.. um.. teach you.
Don't worry, you won
There's still a few jobs you still have to go through. Continue to do so, and he will like you even more
Yes.. Gabriel doesn't like to kill, but he will if he has too. (And you see that in The Tower seige, when he has to turn to his Karambit knife when he needs to after trying to use his rifle to incapacitate them with a shot to the chest, hoping their body armour will stop the bullet)