BUR #9831 has been approved by @evazion.
Currently this tag is used for characters that share no common characteristics.
Aqua is often canonically tagged as goddess despite looking at most like a mage.
Scylla looks like a normal "viking" woman.
Nyx looks like a dark_elf witch of sorts.
Palutena looks like a valkyrie.
Euryale just looks like a normal girl in most of the posts.
Without canonical knowledge none of these stand out as a goddess to me.
Going by the wiki, any character that looks "holy" or has a halo or angel_wings is/can be a goddess, which to me does not seem right, because that can apply to any angel that is sufficiently "holy", or any mage that looks wise or wears fancy enough clothes.
Updated