This man clad in red is named Gaias/Gaius (????, online gaiasu, romanization not official), and is regarded as "The Hero of A Jule" and also its current king. He is voiced byRy?tar? Okiayu, the same VA who voiced Dymlos and I think, Miktran/Kronos in Tales of Destiny/Destiny 2. He is designed by Mutsumi Inomata, and his line in the scan is "I will not perish, as long as I have the will to guide the weak." He unifies the northern continent with his charm and his power that does not seem human, he is a hero who has formed this mighty confederation/union.
There is also info floating around regarding the other mystery character in the box art. This info was supposedly from Weekly Jump, but since this is the only Tales-related info in this week's WJ, consider that info as false.