So you went the way of the space animals did you? That's ok, just don't spam falco's blaster too much.

Squirtle is a nice pick but you might want to get good with either Charizard or Ivysaur too seeing as how you are probably going to switch into them quite often.

Toon Link is a nice character to get good with mostly because he is better than Link IMO with his bombs having a bigger blast radius, and he is fast. You might want to practice spiking with his sword stab, It's too much fun.

Yay, Luigi is awesome plain and simple. As for Ike, and ROB I can't say much due to me not being used to them.
I have learned a lot of new tricks with Lucario and might even start to main him as well. He is probably the only character that can put wall clinging to good use (alternative to grabing a ledge), and Double Team can KO opponents when Lucario's damage is at least around 160%.