Jesus is biologically the seed of David through Mary whose father provides the tribal lineage.
You asked:
What is the Messiah to do when he comes and can you prove using the Tanakh the Jesus fulfilled what the true Messiah was to do when he came?
According to the Tanakh, the Messiah must be a Davidic king born in Bethlehem, a prophet like Moses, rejected by His people, pierced, killed, yet vindicated by God and raised to life, and He must inaugurate the New Covenant. All of these are Tanakh‑based requirements, and Jesus’ life, death, and resurrection match each of them. The remaining prophecies—global peace, universal knowledge of God, and the restoration of all things—belong to His final reign, which the Tanakh itself places after the suffering and vindication phase.
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