Hmmm about Logias, it really means 'natural type' as written in japanese. By that, if anything is of nature, it is possible. And if elements = nature, take a look at the elemental systems:
Japanese/Greek/Indian/Tibetan elements: Earth, Fire, Wind, Water and Sky/space/heaven/aether
Chinese elements: Metal, Wood, Water, Fire, Earth
In One Piece, even smoke is a Logia, which can be said as a compund element, then theres darkness and light. We can probably include space, metal and wood to be natural elements for possible Logia candidates.
If a new member is to have a logia ability and we do not want him to be intangible, he could well be metal or wood.
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