Ideally, PCs should have some form of bond to make the want to adventure together and support each other. I think I’ve done this by means of some random-roll bonding mechanics to be used before starting the game, every time a new PC is introduced.
First, each player must make a Bonding Roll vs. every other player. The Role to use is Orang Dakila. If the PCs are of different castes, +1 die to Orang Dakila vs. any other caste, +1 for Orang Kaya vs. Orang Malaya or Orang Dukha.
Victory means the other PC owes your character; Defeat means you owe the other PC; and a Stay means you are united by some common issue.
Possible common issues include a heroic rivalry for Renown, a shared experience like growing up together or being shieldmates in a battle, having a common enemy, or being blood brothers.
Debts can be for material goods, favors, or a life debt made in gratitude for some great service.