Hmm... Marth seems a reasonable first character to use... none of the spaicies are pick-up and plays except for maybe Wolf... G&W & Snake are awkward/technical which is why they aren't good starter characters respectively.
Sonic is NOT a pick-up character, I've said it once, I'll say it again. He has a very high learning curve, not to mention little reward from his playstyle which would drive any curious person away from playing Sonic.
The guy who mentioned DK has some points, but now what is the purpose of this thread, to find out who is the best starter character/what character do newbies flock too the most/what starter character is good for "getting started in the Smash series"'/what character will help you prepare for the future of your smash career, or what's the deal here?