He was meant to be the goddess's replacement from the start. That's why Tsukuyomi brought Makoto in knowing he would be rejected by the Goddess. Note that the other two Heros passed the beauty test. It means that Makoto is allowed to do his own thing instead of being under the goddess's thumb.
Makoto finally unleash his true potential within him and made goddess chosen heroes or dragon hunters might attack Demiplane citizens or trading partners that connected with Demiplane.
Mana Matter reminds me of Armor from X-men honestly in her case the "Solid shape" is made of Psychokinetic Energy instead of mana but the end result is roughly the same, high def,and absurd physical attack power.
