Just to build on my previous post, i have a handful of examples of how a basic understanding of techniques/fight strategy/styles can give you a unique and subtle tool for building your characters.
Take the longsword. A versatile weapon with many different techniques to apply: thrusts, slashes, pull-cuts, binding (wrestling in weapon-weapon contact), body contact wrestling and throws, offsetting strikes to the opponent's weapon, deflecting with blocks, counter strikes with a built in defense, etcetera. Having a good understanding of how all those elements interact will grant you the intuition to understand what kind of techniques a character with their specific mindset may prefer.
Someone confident in their athleticism, with a penchant for studying the groundwork of any skill rather than it's finer nuance, yet also cautious and averse to unnecessary danger or uncertainty might prefer to lead the fight with his footwork: taking superior angles to limit both the defensive and offensive options of his opponent at once, keep his distance to maintain full field of view and have plenty of time to react and in general, stay evasive and trust his body more than his weapon.
Take another character, who in opposite, is eager to give due diligence to the finer and more specialized techniques of the longsword. Inquisitive, aiming to study and pick apart even his opponent - their style could be more focused on probing reactions, provoking them and punishing where the opponent's knowledge is lacking, doing so by switching guard positions to either threaten or welcome the opponent, throwing single attacks to see the opponent's reaction, often clashing to bind the opponent's weapon, granting him control and the ability to physically feel the changes in pressure through his own sword as the opponent wrestles back or tries to disengage, feeding a flow of information that he can expertly and subtly adapt to.
Or maybe the character you're looking at is bloodthirsty and grim: they have a weapon in their hand, they know well that it's used to maim and kill, and their mindset is that of egomaniac superiority and seething contempt, urging them to crush the opponent as fast and mercilessly as possible. Then, unlike the previous two fighters, who, by virtue of their mindset and style would be more than happy to let their opponent attack first and walk themselves into a counter, this character would always take the initiative, diving in to immediately threaten the opponent with a deathblow - and as everyone is forced to respect the possibility of getting their head lopped off, this naturally elicits a reaction that the initiator can play off. Leading the fight with attack after attack, they put the opponent in a state of panic and force them to defend with increasingly desperate and disadvantageous moves; but if the opponent gathers themselves and fights back, then the aggressor can still easily take their turn back with a feint; and unlike more patient fighters, who might feint and wait to see the reaction, the aggressor feints and then immediately attacks in order to intimidate the opponent and make sure that they will be afraid to try counter - as any strike could turn out to be a feint with no pause before the follow-up attack, leaving no opportunity for them to retract their ill-timed counter.
Of course, you shouldn't expect your reader to immediately catch on to these correlations. However, comics are incredibly versatile in their ability to show, not tell, and with a bit of pause, focus, intent in your paneling, some artistic exaggeration or good use the occam razor (narrowing it all down to only the relevant and speaking details), you can make it shine without a single written word, through action and mood alone.
