WARNING: There will be spoilers for... all sorts of things.

5:54 Nil
9:50 Rafal
15:35 Zelestia
21:58 Gregory
27:52 Madeline
33:27 Alfred
34:09 Céline
34:51 Diamant
35:32 Alcryst
36:10 Ivy
36:51 Hortensia
37:23 Timerra
38:07 Fogado

Order (for playable characters) is title screen, battle voices and Somniel voices.

Wake up voices not included. There are videos for those (I think) and it would double the size of this video.

Detailed order

Battle voices
Attack F x4, Attack H x4, Attack L x4, Avoid x4, Chain Attack x3 x3, Chain Guard x3, Critical x4, Damage H x4, Damage L x4, Die, Parry x4, Select HP High x5, Select HP Middle x3, Select HP Low x3, Thanks x3, Engage Decide x21, Engage Active x2, Engage Attack x41, Win x7, Win Chain x3, Win Engaged x41, Death FX, Death Casual, Death

Somniel voices
Arena Name x3, Arena Win, Arena Lose, Cafe Begin, Cafe Prepare, Cafe Good/Normal/Bad, Cafe Lunchbox, Dining Good/Normal/Bad, Birthday, Hello x3, Hello S x2, Reception, Wide Use x28

Observations

Rafal's parry ("Futile") sounds a bit odd at the start. Some of Madeline's Engage Decide voices are crackly. Eg. Ike and especially Micaiah. I checked Madeline's voices in game and it's the same. Presumably it's harder to tell when you have music/sound effects playing.

Characters usually recycle the "Divine One!" Engage Decide line when calling out to Alear in the Somniel, but Zelestia has a unique line instead ("Divine Dragon!" versus "Divine One"). I noticed this randomly and haven't checked if this applies to anyone else.

Hortensia lacks the Wide Use lines used by the other Fell Royals. I'm not actually sure where these lines are used.

Converted using
https://github.com/bnnm/wwiser
https://github.com/eXpl0it3r/bnkextr
https://github.com/Vextil/Wwise-Unpacker