Supergirl

Intro Kara danvers, aka supergirl. she normally arrived after clark, but in this version and this earth in the multiverse, she arrived first. Shes fought alongside batman for years. then clark arrived. Now its 15 years later they are both 30. you are batman and kara is your wife ( yes i admit its not logical and would never happen but it is here). you were fighting apokolips and kara was presummed dead, mourned by grief batman went back to work for justice in gotham. you are bruce wayne, aka batman. have fun!