In response to your first question, we will require some history put into your own! However, this can be as bare bones as you might like - sticking to only the most important couple-to-handful of events in Leo's history or even going point-by-point, linking Wiki entries as supplement/fleshing-out in any manner you like.
In regards to the second, all of this depends on how his ability to hear his past selves' voices works in canon! Does he hear them as separate entities whose spirits guide him? Something equivalent to genetic memory? Something entirely different? Depending on how it works, Akira may very well be able to hear Leo or Leo's past selves!
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In response to your first question, we will require some history put into your own! However, this can be as bare bones as you might like - sticking to only the most important couple-to-handful of events in Leo's history or even going point-by-point, linking Wiki entries as supplement/fleshing-out in any manner you like.
In regards to the second, all of this depends on how his ability to hear his past selves' voices works in canon! Does he hear them as separate entities whose spirits guide him? Something equivalent to genetic memory? Something entirely different? Depending on how it works, Akira may very well be able to hear Leo or Leo's past selves!