What of Louis Dupré, who was a newcomer to the London stage? How did he portray Mars?
Dupré is still too often identified with ‘le grand’ Dupré of the Paris Opéra. Some years ago, I published an article that disproved this idea on the simple grounds that the two men were performing on opposite side of the English Channel simultaneously.
A dancer named Dupré is first advertised on 22 December 1714 at the Lincoln’s Inn Fields Theatre and appeared there regularly during the 1714-1715 season. He then moved to Drury Lane, where he danced for the next two seasons, appearing in The Loves of Mars and Venus during that period. Dupré’s skills are often solely identified with the serious style, but from soon after his arrival in London he regularly performed a Harlequin dance. There is even a notated Harlequin choreography dedicated to him, which claims to include some of his characteristic steps and moves. The dancing skills that Dupré was able to bring to the character of Mars are amply demonstrated by the ‘Chacone of Amadis’ created for him by Anthony L’Abbé, probably around the time of The Loves of Mars and Venus. This solo contains a panoply of early 18th-century male virtuosity, from entrechats-six to multiple pirouettes and tours en l’air.

L’Abbé, ‘Chacone of Amadis’, A New Collection of Dances, [c1725], first plate
There is no known portrait of London’s Louis Dupré. This design reflects contemporary ideas about the appearance of a classical warrior.

A late 17th-century costume design for a ‘Combattant’.
Although the London Dupré was obviously more than just a serious dancer of the type that Weaver criticised for lack of expression in his Essay towards an History of Dancing, Mars is given fewer explicitly formal gestures than either Vulcan or Venus. Weaver describes the character thus in his scenario for the ballet:

Weaver, The Loves of Mars and Venus (1717), p. xv
In scene 1, Mars dances an ‘Entry’, probably intended to show his power through a display of virtuosity, and a ‘Pyrrhic’ mimicking hand-to-hand combat with his Followers. In scene 4, he woos Venus in mime but his gestures (as well as those of the other dancers who take part in this scene) ‘are so obvious, relating only to Gallantry, and Love; that they need no Explanation’. Mars is asked to show ‘Gallantry, Respect; Ardent Love; and Adoration’ before Venus, a sequence that creates a crescendo of feeling. In scene 6, after being caught in the net with the goddess, Mars shows ‘Audacity; Vexation; Restlessness; and a kind of unwilling Resignation’. Weaver describes ‘Resignation’ as ‘To hold out both the Hands joyn’d together’ adding that it is ‘a natural Expression of Submission and Resignation’. Were ‘Audacity’ and ‘Vexation’ perhaps modified versions of ‘Threats’ and ‘Impatience’?
The way in which Weaver depicts Mars is reflective of the God of War as a man of action rather than one of thought or feeling. This may have had more to do with Weaver’s concept of his ballet and its characters than with Dupré’s supposed limitations when it came to gesture.