I fell off the whole Transformers wagon a long time ago... only for my mecha obsession to be rekindled in 2013 by another franchise.
Namely, Super Robot Wars. I originally got into the series thanks to the background music, which is honestly the best video game music I've EVER heard.
Axel Almer's personal bgm, "Dark Knight". Axel's voice actor plays Inferno and Shockblast in Transformers Galaxy Force, along with Nightscream in the Japanese Beast Machines.
https://www.youtube.com/watch?v=A5WdmiJ1-KI
Gilliam Yeager's personal bgm, "Hero Chronicle". Gilliam's voice actor plays Star Saber in Transformers Victory.
https://www.youtube.com/watch?v=lWR3KZT-res
Shu Shirakawa's personal bgm, "Dark Prison". Shu's voice actor plays Optimus Primal in Japanese Beast Wars. (Shu is terrifying and scarily competent compared to all Transformers characters. He's only 22 years old, but still managed to design and build a mecha that can CREATE BLACK HOLES. Heck, when he upgrades the machine, it can wipe out an entire galaxy in a single hit and kill 16,000 enemies on autopilot.)
https://www.youtube.com/watch?v=uUrMAC1w8ns
Ingram Prisken's personal bgm, "Emissary from the Void". Ingram's voice actor plays Sideswipe and Jazz in Japanese G1. ...Ingram is one of the most mysterious characters in the entire franchise, and I STILL don't know who or what he actually is. Or how the heck he ended up in a body that wasn't his own.
https://www.youtube.com/watch?v=WRG2V04C3YE
Haken Browning's personal bgm, "All Correct!". Haken's voice actor plays Rampage in Japanese Beast Wars and Jetfire in Transformers Superlink.
https://www.youtube.com/watch?v=DM7wgDywGUU
Touma Kanou's personal bgm, "Fighting Spirit, Without Limit". Touma's voice actor plays Red Alert and Brimstone in Transformers Galaxy Force. ...Touma is INCREDIBLY hot-blooded - I've never heard Yasuyuki Kase scream like that in my life, and it gets spine-chillingly powerful when he does "
RISING METEOR!".
https://www.youtube.com/watch?v=y-24x8dAPmg
Ryouto Hikawa's personal bgm, "Ace Attacker". Ryouto's voice actress plays Lio Junior/Magnaboss in Beast Wars II.
https://www.youtube.com/watch?v=a_sDOv9HlB0
Ryusei Date's personal bgm, "Everywhere You Go". Ryusei's voice actor plays Inferno in Japanese Beast Wars. (Music starts a little late.)
https://www.youtube.com/watch?v=YcNgKmHWuZA
Kyosuke Nanbu's personal bgm, "Steel Beowulf". One of the most iconic themes in the game. Kyosuke's voice actor plays Ravage in Japanese Beast Wars. (Funny thing is, there's a meme about this man that he breaks a mic whenever he yells out loud. ...Has actually happened in real life. His voice is so strong he managed to break a mic by screaming "VOLTEKKA!" at it. And it happened
twice.)
https://www.youtube.com/watch?v=sWc-JqWTkxg
Raidiese F. Branstein's personal bgm, "Ice Man". Rai's voice actor plays Rodimus Prime in Transformers Superlink.
https://www.youtube.com/watch?v=iHwhwT5ckXs
Viletta Vadim's personal bgm, "Woman the Cool Spy". Viletta's voice actress plays Botanica in Japanese Beast Machines.
https://www.youtube.com/watch?v=9mrbk6HG6tQ
Son Ganlong's personal bgm, "Greatest of the Four Dragons". Ganlong's voice actor plays Terrorsaur and Quickstrike in Japanese Beast Wars. He's also Starscream, Signal Flare, Constructicon Maximus and Bulkhead in Transformers Superlink. (Ganlong's mecha, the Ouryuu, is MASSIVE. ...It's 8000 kilometers long which makes this robotic dragon as long as RUSSIA.)
https://www.youtube.com/watch?v=MX1XVISVikQ
Tasuku Shinguji's personal bgm, "Gan! Gan! Gigan!". Tasuku's voice actor plays Rattrap in Japanese Beast Wars.
https://www.youtube.com/watch?v=DxHF_0xGbOk
I actually own the soundtrack with most of these tracks on it! 8D
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Away from Super Robot Wars... we have character songs from Angelique.
This is Mitsuo Iwata (Silverbolt/Jetstorm) singing "Don't Be Afraid!", Zephel's character song.
https://www.youtube.com/watch?v=OYf0dOJA_M4
Nobutoshi Canna (Nightscream) singing "Ashita, Habataku", Randy's character song. One of the best singers in the voice-acting industry. (Heck, this song is from 1996 and he was 28 at the time. He still sings 20 years later; look up "Silent Phoenix" from Dynasty Warriors.)
"Fly! I soar to tomorrow, spreading out my heart
Try! Even if regretful rain was pouring down on me
Fly! I soar ever higher, drawing an alpha
Try! Let us go, to find the seeds of our dream"
https://www.youtube.com/watch?v=KH3Qy7GyIvU
Nobuo Tobita (Terrorsaur and Quickstrike) singing "Gekkou Yoku", Lumiale's character song. You wouldn't think it from his BW characters, but he excels in playing soft-spoken, gentle pretty boys.
https://www.youtube.com/watch?v=xuiJYxUi9m8
Takehito Koyasu (Optimus Primal) singing "Jealousy de Nemurenai", Olivie's character song.
https://www.youtube.com/watch?v=7XO0Xde_TgI
Tetsuya Iwanaga (Airazor) singing "Hakujitsumu ~Secret Dream~", Sei-Lan's character song.
https://www.youtube.com/watch?v=nnsZ-5zdV_w