What a strange site. Apart from the pyramids there doesn't seem to be any consistency between the designs or the marketing. The basses are called Mr <something>, the guitars Blue Morpho. Mr Serious
looks like an Alembic with an unfortunate growth. Mr Pastorius - well, I'm not an expert on the Mr Pastorious we've all heard of, but I can't see the connection.
There's a series of kids books called Mr Men, which would give him plenty of scope for naming future bass models.