Don't fix what's not broken.
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In nerve-free multicellular organisms, the relationships of the cells to each other can only be of a chemical nature. In multicellular organisms with nerve systems, the nerve cells only represent cells like any others, but they have extensions suited to the purpose which they serve, namely the nerves.
For 'Dragon Quest IX,' one of the biggest things was being able to create your own character and your party members, too. The importance of it is that you can customize the face, the name, or something like that, so the party members are really a reflection of you. It becomes more of your own experience.