I've had a good run with Diddy Kong by flowing in chains with his moves. He's very fluent in his attack movements, not to mention the ability to exted his timing via bananas. Depending on the opponent, bananas can be harmful or helpful.This also depends on YOU. Being able to pick up your bananas, reguardless of whether or not they are working for you at that time, is very important. Best not to slip on your own peel when you're about to forward throw your opponent and take his last stock.
For approaches, dash attack is near flawless. It covers a good...I'd say 90-180 degree arc on Diddy's body, from his feet to his head in front of him. It pops up enemies perfectly for follow up chains, such as utilt (which has near no lag). Also, his throws are decent, especially his forward throws and back throws. His fair has better range, and his forward throw is stronger in pretty much all aspects compared to the back throw.
For smashes, Fsmash does well against shielding opponents, since most multi-hit attacks land the more powerful hit after the shield shrinks. Dsmash comes out faster and hits lower, with a slight reduction in power. Upsmash is decent, but if done while dashing it usually doesn't have knockback, since you slide the final hit out of the way in most cases.
Some simple chains to try out might be as follows:
Banana->fthrow->fair
Banana->dthrow->bair
Dash attack->utilt->uair/fair/bair
Natural combo->ftilt(it's surprisingly powerful)
Diddy's KO strength is horizontal, since most all of his killing moves cause the opponent to fly left or right. However, don't let that discourage you from trying vertical KOs/combos. Diddy's dair is a nasty spike, but has a bit of windup lag. Perfect for spiking Snakes on Cyphers ;P
Diddy's moves by themselves are powerful, but manipulating how the opponent moves with bananas and being able to follow up most any approach is a must for a Diddy, in my opinion. Learn some simple chains, try out some of your own combo ideas for sick results.
That's my rant
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