Contrary to his appearances, Taiyang wasn't always the friendly dad figure he is now. As a student in Beacon, he was loud, boisterous, and always itching to start a fight. He not only was strong, but also had a strange charisma and bravado to him due to his overconfidence. He was always confident of his ability to fight and brawl it out, and was always eager to prove so, whether on a Grimm or fellow student - or even a teacher if they pissed him off enough. He was even bold enough to call himself the "King Of Beacon", and didn't particularly care if it was actually true or not.
He would obviously mellow out after leaving Beacon and raising a family, but nonetheless he still has the heart of a lion kept neatly under wraps. As long as Yang doesn't find the photos...
Tai's voice here is considerably deeper than canon, even as a teen, and leaves a lot of leeway for voice interpretation. He's more of a delinquent and loose cannon as a student, but is still prone to making really bad jokes and embarrassing himself from time to time, especially when it comes to trying to flirt with or impress that ice-cold Raven chick.
Sketch of young Taiyang for reference.
Some extra reference for young Tai's general demeanour and personality (Sett from League Of Legends). Less the tone of voice, moreso the choice of words and delivery.
