KH Birth By Sleep Final Mix (PS4) - Mysterious Figure (LV1 Critical/Terra)
So here we are... Mysterious Figure as Terra, probably the most infamous boss fight in all of Kingdom Hearts. This fight very, VERY clearly shows some bosses were not made for Terra in the slightest. Believe it or not, this fight was both easier and beaten faster then Terra's fight with Vanitas Remnant. Though with Vanitas I restricted myself, otherwise he is very easy to exploit. Mysterious Figure on the other hand is always hard and restricting yourself is not recommended.
Word of advice, be aggressive and don't let up! As seen with Ventus, taking it safe really doesn't help and makes the fight take a very long time. Terra doesn't have time, you need to end this fight as soon as possible or your dead. His Doom spell was annoying with Ven and Aqua but it changes the entire fight with Terra since he can't invinci-roll through it.