You guessed it right -- this is the Bruce Lee of the Tekken series. Marshall uses a mixture of various martial arts, but his main style is derived from Jeet Kune Do, which means that just like Hwoarang, he is a fast poker.
On the other hand, Law has a few slow but super damaging tricks under his sleeve. For example, his b+3+4 combo (back + left kick+ right kick) kicks really hard.
His Rage Art (left punch + right punch) is just as powerful: