i have a lot of songs that remind me of my favs and i make entire playlists about it... it's really hard to choose a top song for akechi but i think i'd go with i'm gonna win by rob cantor since it describes him very accurately!
as for minato, it's harder to find a song that really describes him since he has a lot of different interpretations. but for how i see him, i think yoru ni kakeru by YOASOBI describes his relationship with death/pharos/ryoji nicely