Why Did Tobirama Create Reanimation Jutsu?

Shadow Clone Jutsu: Tobirama created Shadow Clone Jutsu to make one or more copies but the chakra would be divided. Tobirama declared this jutsu to be Forbidden. Reanimation Jutsu: Tobirama created the Reanimation Jutsu allowing to bring the dead back to life to control them as puppets.

What jutsu did Tobirama create?

Tobirama had great intellect and he developed several jutsu. He is responsible for the creation of extremely powerful jutsu such as Shadow Clone Jutsu, Impure World Reincarnation, Flying Thunder God, etc. Most of his jutsu are labeled forbidden.

Who created the Edo Tensei?

This was one of the main purposes Tobirama created the technique for, as he would use one or more reincarnated souls to perform a series of Kamikaze-like attacks until the opposition was wiped out; he created the Mutually Multiplying Explosive Tags specifically for this purpose.