Ganon
ground flame choke directly into down tilt. This will do lots of damage.
Use his forward and down tilt attacks a lot. They are both faster and have better range than his neutral A, which also doesn't combo into anything really. Forward tilt is great for smacking players offstage and down tilt launches people up.
Luckily for ganon, his aerial warlock kick has surprising priority and speed, so use it to punish players that try to take advantage if you get knocked up high into the air. When it lands and hits the ground, it's actually pretty good at launching them if it hits. If they're trying to kill you in the air (fuck you Fox), this is a great move for making it back down to the ground.
Warlock kick can leave him open and can be very predictable, since most people try to use it close distances. So use it moderately.
A great time to use it is when you expect them to roll towards you or behind you. This will either hit them as they end their roll or they'll roll behind you and your kick will take you a safe distance from most retaliatory moves. You can do this with the flame choke similarly.
If you're trying to approach someone from the air or someone is jumping at you, a good technique is use neutral aerial. This double kick can potentialy get them with the second kick if they try dodging and is one of his quicker moves as well. Use down to speed him down to the ground at the right time to either land his second kick on a standing foe or just reduce his landing vulnerability.
I almost never ever use warlock punch, and any time I use his up tilt, it is really a failed up smash.
Down smash be great with prediction.
When ganon, stay calm and don't try to make him a speedy character. He requires a steady hand and judicious use of his tilts. If you really have to close the distance, use rolls and use his running attack to neutralize most projectiles and attacks. If they're attacking you with small stuff that doesn't make you flinch, don't sweat the small damage and close in. He can take a LOT of hits. Your opponents can't take many from Ganon. They will lose the tradeoff.