Cypher, Killjoy, Viper, Jett, Breach?
ngl i have seen a lot of KJs on Fracture just farming ult orbs and doing that Under B site tunnel ult for retakes or just taking control of the site while on attack. that does help the team a lot.
But I also chose cypher because there are so many object/boxes/ridges around the map that you can put tripwires for almost anything.
and imo double sentinel on fracture is good? because each site has 2 entrances and its hard for one sentinel to support everyone.