Each character has at least one voice trailer, with a few spoken lines; here, I've translated all of them (separated by character; characters with both a regular and a trap reaction trailer are grouped together by character!).
(Note that this does not include all character trailers on the official channel, just the ones that fit into the broad categories of initial trailers, trap reaction trailers, and phantom illusion trailers; they follow a particular pattern, hence their being combined here.
(The videos are embedded, so in the interest of not loading 100 youtube videos and crashing your browser, they are separated into separate pages.)
The Cat's Whiskers
Saimon Naoakira
Original Trailer
I suppose we have no choice but to teach these young people who only know about popular music a thing or two about what real music.
Of course, if you're going to do it at all, you should aim for the top.
Trap Reaction Trailer
Shall we show everyone what real music is?
That I have to live with myself for the rest of my life, having done this, horrifies me to the depths of my soul.
Phantom Trailer
Shall we show everyone what real music is?
To connect people with one another through music... that is my goal.
Kanbayashi Yohei
Original Trailer
Alcohol, tobacco, and cool hiphop. Long as I got that, I don't need nothing else.
It's best to just throw away things that are broken and forget about them.
Trap Reaction Trailer
Let's do this, Saimon! Just like we did before.
Tsubaki-san was... the person who taught me about music. And that's all.
Phantom Trailer
As long as I've got hiphop, that's all I need.
It's the least that those of us who were left behind can do.
Natsume Ryu
Original Trailer
Yup, yup, yup, Ryu-kun knows the answer! Hey, no he doesn't, you liar! Or maybe, he does after all?? Which could it be? Ryu-kun doesn't know!! EHAHAHAHAHEH!
Nobody can ever really truly understand someone else's true feelings.
Trap Reaction Trailer
Alright, roger that! Charismatic Bartender Ryu-kun is ON THE JOB!!
Hmm, let's see... I lived in a big white house with tall white walls, and I played with a whole bunch of people there!
Phantom Trailer
Here-here-here it comes comes, Ryu-kun's coming right at'cha!!
If you only look for the things you want to see, you won't see anything at all.
Ando Shiki
Original Trailer
The owner is trying to protect the music we make together, and I want to protect it, too... that's what I think.
Is it... okay for me to be here?
Trap Reaction Trailer
I... I have to go. I have to face it and make sure...
That was where... I... I killed a very precious friend...
Phantom Trailer
I want to run away... but I know... that I have to face it.