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WRT Bobs - one good thing about games of this type is that the bitmap Y-position for the bob also equates to the Z-position (into the screen), so a quick bubble-sort for viewable bobs will result in the paste order, ensuring that the bobs towards the 'front' of the play area are drawn last.
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Yes, although a small offset correction to the drawing Y position is still needed for each character, because they can have different heights. So instead of the Blitting position Y we have to check the "feet Y" coordinate, that is the Y point where the bottom pixel row of the characters feet is located.
But other than that, it should be quite simple and semi-automatic; each frame a "drawing list" is constructed according to the feet Y, and the characters whose feet are higher on the screen are drawn first.