Bronya Robin Gallagher is such a good combo. I had some fun using it recently with Jingliu (which is way more usual I guess) but I managed to get 40k in PF and over 3k7 in AS which goes to show how insane this the synergies between the three really is.
This team work by letting Gallagher w/ qpq light cone to take turn as much as possible through his Ult/bronya 100% action foward to active qpq's effect continuously to regenerate robin's energy faster to 100% the whole team many time. You can only use Gallagher atm because he is the only Abundance character atm that can take turn continuously. Bronya or sparkle are both fine but make sure sparkle/bronya are action after Gallagher and your sparkle wouldn't miss him after her. And Sparkle/Hanabi should be wear DDD
How about replacing Galagher with Aventurine? For a more constant shield. Out of that, Aventurine synergizes pretty well with Robin, and his FuAs are also a bounce hit. He constructs a huge amount of SP (maybe enough for Bronya to spam her E on Jade, Jade might have to reset her skill sooner, but somewhat help her retrieve her ult later on, and Jade's actually a SP positive unit), and procs Jade's FuA with his own FuA. I don't really see the point of putting Galagher here while you can go for a better option, perhaps I'm wrong?
Gal use for generate stack for Jade, also use trade lightcone (sorry I don't know the name, only knows this is create energy). Robin only enough energy to until 2 times if u have high speed healer use this lightcone. And finnaly, number of turn Gal help to increase dame of Robin.
First of all, this is E1 jade. In her E1 attacking single target gain 3 stack. Gallagher is the most sp positif sustain, and don't forget if there more than 2 enemy Gala can use his ult to gain more stack. You literally just need put speed until 161 and use pro quo and err rope, he is the best sustain for E1 Jade hypercarry.