Mortimer is too much like Mr. Grimm in personality for me to like much. Zero points for originality.
And his car doesn’t save him either.
His ending is more like Mr. Grimm’s in the first Twisted Metal. He wants revenge on Calypso and decides to leave him a little present.
Which causes souls to come out of nowhere and carry Calypso all over the world but it’s definitely implied that Calypso survives the ghoulish ride.