He is tied for third on the tier list with his brother Luigi. Mario has excellent horizontal movement, good damage racking ability, and good kill power. He has easily the best projectile in the game, the Fireball, due to its very fast speed and firing rate. The Mario Tornado is a good turtling move, as it comes out fast, surrounds Mario on both sides, has a long active period, and has instant-killing properties.
True to his name, Mario has nothing that could really be considered a weakness, other than the possibility that Luigi is slightly better than him. This "Jack of All Trades" characteristic gives Mario strong match ups across the board, resulting in his high placement.
Mario shoots a fast-moving fireball. The fireball bounces but is not affected by gravity. This move can be held down indefinitely, but take note that Mario moves forward a little each time he shoots a fireball. It should also be noted that performing this move again while another Fireball from either of the Mario Bros. is still onscreen cancels the previously existing one out.
Mario delivers two punches rapidly, the second only for a single frame; pressing twice in succession makes Mario kick. Holding down the attack button produces the same effect. It is good for racking damage and KO'ing, because of its decent knockback.
Mario slides while kicking with his foot. It has decent knockback. This move can be held down indefinitely. If aimed properly, it can hit multiple times, dealing huge amounts of damage such as 153%. This move can be canceled with a jump.