As you noticed, the characters from Issa Ilusyunada rely mostly on their voices─because, why not coconut?

My references are from Youtube and listened to it a lot of times until I can find simple word/s to describe it. And here they are

Frankie: mababa at malamig na parang galing sa hukay. (Hozier)

Jack: magaspang na parang may sore throat (Omri)

Barbara: ito 'yong perfect sa ugali ni Barbara (We are Fury)

Harold: playful, minsan matino, minsan hindi (Reach)

Tatay: malamig at ma-awtoridad (The White Buffalo)

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Isabelle: 2023 na, wala pa rin akong mahanap na boses na swak sa ugali niya.