Your comments are very good. I was thinking here. Is each Naga of the Fire Emblem someone in each? I saw a phrase and remembered a few.
“I appear before man in many forms: sometimes a great hero, sometimes a harmless child,”
No end of New Mystery. Kris says to erase his name. At the same time that Marth says that she feels very close to him and does not know how to explain.
Naga always leaves and does not like to boast about his achievements.
He is a descendant of Anri. Who has the blood to wield divine weapons.
Tiki became a Naga. It is more like the divine title. Nagi is a reincarnation. One cited in waking up another in the Shadow of Dragon.
Thinking here that even Mark that also some and others. That we could be Naga himself or his reincarnation.
Now my head is thinking of other possibilities. Lol. Because there are many in indirect ways.