Select one ally. You and the target roll for initiative as normal, then both use the higher result.
Is that the result of the d20 roll that is shared, or the entire initiative roll result including the possibly very different bonuses to the d20 roll?
Concrete example:
I have an Envoy character in a game that uses Danger Sense and targets the Witchwarper ally. The Envoy has a perception bonus of +9 and the Witchwarper has a perception bonus of +8. The Witchwarper rolls a 4 for a total of 12, and the Envoy rolls a 13 for a total of 22.
Does the Witchwarper get the die roll of 13 and their +8 bonus for a total of 21 initiative, or do they simply also get the final result of 22 initiative same as the Envoy?
Fortune effects normally apply to the d20 roll.
But normally, fortune effects are rolled for the same character and will have the same bonuses to the roll result.