As a god, yes, he brought back his mother Semele and she became the goddess Thyone.
His power is to bring dead people back from the underworld
He can make a person go mad and he can bring back a person from the underworld.
The god Dionysus descended into the underworld to bring his mother Semele (and perhaps also his wife Ariadne) back from the dead.
Dionysus
He didn't. There was no such myth of Semele being brought back to the mortal world alive by Dionysus. For the fact, that she has already been killed by Hera.
Orpheus went to Hades, the Greek Underworld, to bring back his wife Eurydice.
they brought back cows girafs and people
Hephaestus and Dionysus were good friends. It was Dionysus that Hephaestus let take him back to Olympus.
many believe that the ancient gods will find their souls and bring themselves back from the underworld.
A comedy by Aristophanes in which Dionysus travels to Hades to bring back the dead Tragedians. Virgil's Aeneid also has him play a part.
He did not. However, he did have to go to the underworld and bring back Cerebus, the three headed dog guarding the underworld, but it was Zeus who brought back Persephone. P.S- Persephone ate 6 pomegranet seeds, so to be fair to Hades and Demeter, Persephone was forced to stay in the underworld for 6 months every year.
Eurydice's name is the same in Greek and Roman mythology. Her husband Orpheus tried to bring her back from the Underworld after she died from a viper bite.