Not very good against fast characters that can pressure him or interrupt his projectiles
Few moves with KO Power aside his Smash Attacks and Up Tilt
Requires some proper spacing in order to be effective
All Smash Attacks have high ending lag
In long range, Mega Man is a very versatile character that works very well. Mega Buster is fast, although not having high range, but can keep enemies at bay and interrupt their approaches. His Forward Tilt gives him this advantage as it's the only one in the game that can be used while walking. The Crash Bomber is good to distract the opponents, as they will either try to remove the bomb or shield it, giving a open spot to attack. His Leaf Shield, while overlooked by some players because it blocks most of his actions, it has good utility, being able to dish extra damage during grabs as well as blocking projectiles.
When enemies can reach Mega Man for close-combat, he as few tools that can help him knock them back, such as his Mega Upper (Up Tilt) and Slide (Down Tilt). He is also good on air, with his aerial attacks having great utility. Flame Sword (Forward Aerial) has high priority and a disjointed hitbox, while Slash Claw (Back Aerial) is a very fast multi-hit attack. In addition, his Air Shooter (Up Aerial) works similar to Mr. Game & Watch's Up Aerial, but causes damage, in addition to hit multiple times. Finally, his Hard Knuckle (Down Aerial) is a solid Meteor Smash, and it's the only ranged Meteor Smash in the game.
One of Mega Man's problems, however, lies in his predictable recovery, relying only on Rush Coil to come back at the stage; and because of that he has no horizontal recovery. Also, when pressured, Mega Man has little to do, as characters such as Pit and Fox can reflect his projectiles and punish him easily. His lack of proper KO'ing moves allied with the fact that his Smash Attacks, specially Up and Down Smashes (as his arms have to vent), makes Mega Man a hard character to kill with.
Neutral Attack (Mega Buster) - Fires a pixelated energy shot in front of him. Can quickly fire up to three shots in a row, taking a short pause before being able to fire again. Each bullet deals 1-2% damage. When fired at point-blank range, it does 3% damage and pushes the target. Mega Man can also quickly turn between shots to hit multiple targets.
Forward Tilt (Mega Buster) - Same as his neutral attack, with the added benefit of moving while shooting (thus hitting faster), but without the benefits when used at point-blank.
Up Tilt (Mega Upper) - A powerful uppercut that makes Mega Man jump off the ground and send foes soaring into the air. Does 17% damage to close opponents in the beginning of the attack, 12% if hit during the attack, and 8% when the attack is ending.
Down Tilt (Sliding) - A leg-first charge along the ground. Can be used to move under certain projectiles. Closer targets receive 8% damage and are pushed up, while farther ones receive 5% and are pushed forward.
Dash Attack (Top Spin) - A rapid rotation attack forward that hits multiple times. Each hit deals 1% damage, with the last hit doing 3% and pushing the target, doing a total of 10% damage.
Side Smash (Charge Shot) - Mega Man unleashes a more powerful energy blast from the Mega Buster, causing 10-12% damage. The damage and distance increases the longer it is charged, causing 20% damage when fully charged.
Up Smash (Spark Shock) - Two electrodes appear in Mega Man's arms and come together to give off damaging sparks, hitting multiple times to anyone near him, specially above. After use leaves him vulnerable to attacks while his arms vent. When used quickly, each hit deals 2% damage, with the last one causing 6% (total 16%). When fully charged, each hit does 3% damage and ends with a 9% hit (total 22%).
Down Smash (Flame Blast) - An arm cannon at each side of him releases a high pillar of flames. After use it leaves him vulnerable to attacks while his arms vent. Causes 17% damage when used quickly, increasing up to 24% when fully charged.
Most of his sound effects are based on his NES incarnation. In fact, Sakurai said that keeping his NES style was a top priority.
Mega Man is the first character to have a custom death explosion, specifically exploding into balls of light in the same style as the original Mega Man games.
Mega Man's Final Smash includes Mega Man X from the eponymous series, Mega Man Volnutt from the Mega Man Legends series, MegaMan.EXE (Hub Hikari) from the Mega Man Battle Network series, and Mega Man (Geo Stelar and Omega-Xis) from the Mega Man Star Force series.
Mega Man's jumping style originates from the Mega Man game franchise.
Mega Man newcomer artwork based on the cover art of his original games.
Mega Man's newcomer intro scene.
Mega Man throwing his Metal Blade.
Mega Man with Rush which is part of his recovery.
Mega Man using Leaf Shield which can absorb weak attacks and can also hit opponents on its own.
Mega Man being showcased to see what customizable moves are available for him including different renditions of his recovery and Leaf Shield.
Mega Man's newcomer profile picture on the official website.
Some more Mega Man artwork.
Mega Man after he's stopped from full speed running.