[quote=@ArkmageddonCat]And the next question is: For side characters/mechanics/engineers, what do you expect in a sheet? And could those characters be used IC before their sheet is completed?
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It probably depends. If you are going to flesh them out as people, I would. However if they are merely blank NPCs that are there for your main characters development, they probably don't need a CS.

Thats why Thomas and Philip don't have any surnames. Theyre just mechanics to add a voice for Tahlia to talk to and generate a feeling of multiple people on the base.