Old and Separate
The character 古 (old) is used to make 個 (separate).
So, as you know by now, we have gattai (合体) aka union(s). In the first Aquarion series, there was also nenshin (念真) gattai (合体) indicating that the elements in the union were genuinely (真) united through their thoughts (念). The character used for thought (念) is made up of 2 other characters: now (今) stacked on top of heart (心).