Since you have the Astral Emblem at hand and if your party has six characters or less, you’ll have an option to recruit T’nique while you’re here.
Head to the arena and enter a Rank D fight or above. Win the first four battles and a challenger will butt in on the last battle. Defeat this challenger and after the battle, he’ll approach you and he’ll ask if you can take him along. This is the only chance you’ll get whether you’ll recruit him or not.