We have our own ki or spiritual energy and it can recover overtime, we will leave it a mystery.

Name
Gender
Age
Spirit this is optional
Type, what is your power type?
Personality

blah blah blah.....

Reiji is what you call spirit reserves or spirit energy, rei for short.

Bukizoku known as weapon connection, people are able to conjure weapons at will whether elemental or not.

Mahozoku known as magic connection, people are able to learn a new reserve which is magic thus you can learn any magic.

Tamazoku known as soul connection, people can use soul based powers and use spirit familiars.

Juzoku known as summon c8nnection, you are a beast tamer and summon your familiar spirit in physical form in real world unlike connection which is only spirit and fusion.

this is like Hunter x Hunter, the four principles and you are either born with one connection or have to learn it which will he innate powers.... skilled people can have 2 types of connection and 3 types are super skilled and 4 types is rare in a million years