I like "heavy." I also like "brute" but that has negative racial connotations for some people. "Goon"?
In the fiver band tropes:
Jock (lead singer)
Rebel (lead guitar)
Big (drums)
Heart (accompaniment singer)
Smart (keyboard)
The Tough, Brute, etcetera correlate the Big. A Big is the idea of an "army of one".
There is also a "Sixth Member", the idea of someone from the enemy serving as a double agent, and who occasionally helps out the team.
The Heart is sometimes called the "Chick", under the influence of Princess Leah from Star Wars functioning in this role. But the Heart is just as likely to be male, such as a romantic dreamer.
The Rebel is an Antihero, but the identity is more specifically, the opposite of whatever the Jock is representing. The Jock is typically the hero of the story, and is well-rounded, while the other members are more specialized. The Jock can have many personas, depending on the nature of the story.
Characters can function in different roles at different times, depending on story.
In old school species: Human (Jock), Halfling (Rebel), Dwarf (Big), Elf (Heart), Gnome (Smart), and Orc (Sixth).
In 5.5: Human (Jock), Tiefling (Rebel), Dragonborn (Big), Dwarf (Heart), Elf (Smart).
I think I am ok with "Tough" as a profession statblock for the role of an "army of one".