hmm well...as far as approaching goes you can mash B so you end up spinning and creating a tornado...oh wait wrong character.
Brawl isn't a game with much variety, especially when it comes to Ike. It's all about knowing your opponent's habits by studying them before hand and then applying the counter to their flaws. If it's someone you've never seen before, playing defensively to learn their style is a good way into learning how to approach them. So if it's a person who dodges a lot, a regular short hop n-air will hit them and lead to some jabs. Or if they shield a lot, start off with a grab. It's just about reading the opponent..
Also, you know this Kimch, but working on the B-air approach, you can do a retreating b-air to lure them, and turn in and jab.