I can learn how to make voices in the dialogue?
Viewing post in Eeveelution Memes & RPG Dialogue DEMO comments
From your previous comment, I'll assume you're using Ren'Py? If so, you'll want to look into the example code for character callbacks: https://www.renpy.org/doc/html/character_callbacks.html
I'm not a Ren'Py expert, so I'd recommend going on LemmaSoft for these questions. If you're looking at dialogue boxes per character, this thread may help: https://lemmasoft.renai.us/forums/viewtopic.php?t=42205#p441365
That being said, what are you planning to make?