According to the Japanese Mario Tennis Open site, you'll be able to play as these dudes via QR Codes:
http://www.mariowiki.com/images/0/09/Yoshis_MSLOG.png
They have individual stats BTW. And before you ask, I did a self-translation of the information given on the page in question, so this is indeed correct info. And no, the pic I used isn't on the site; it's just a reminder of what the 7 not-green colors of Yoshi are.
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As far as Kid Icarus goes... I'd be up for some battles.
http://www.mariowiki.com/images/0/09/Yoshis_MSLOG.png
They have individual stats BTW. And before you ask, I did a self-translation of the information given on the page in question, so this is indeed correct info. And no, the pic I used isn't on the site; it's just a reminder of what the 7 not-green colors of Yoshi are.
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As far as Kid Icarus goes... I'd be up for some battles.