Eltab
Lord of the Hidden Layer
Have you had previous experience with this DM hogging spotlight or solving the group's problems for them via a DMPC?
I've played a DMPC. I started in the group as a player. When our DM finished the IRL school year he moved back home. The group asked me to take over as DM. (I consider this a complement and statement of trust.) My PC stayed with the party for a time, moving into the background as the plot progressed. in-game excuse: beat up and suffered 2 failed death saves, survived anyway; i re-statted him for permanent physical disability. He left the group and became a 'spokesman for patron' type NPC when we reached The Big City.
Granted the OP situation is different in that the DM wants to begin with his own PC, but I am unwilling to presume this will auto-create problems, without more description of DM and his history.
I've played a DMPC. I started in the group as a player. When our DM finished the IRL school year he moved back home. The group asked me to take over as DM. (I consider this a complement and statement of trust.) My PC stayed with the party for a time, moving into the background as the plot progressed. in-game excuse: beat up and suffered 2 failed death saves, survived anyway; i re-statted him for permanent physical disability. He left the group and became a 'spokesman for patron' type NPC when we reached The Big City.
Granted the OP situation is different in that the DM wants to begin with his own PC, but I am unwilling to presume this will auto-create problems, without more description of DM and his history.