I think Yoshi's biggest hint is that he wanted to keep the red theme on his spiderman shirt. Why? I believe he wants you to think Red Mage because spiderman also has blue on his outfit. So im guessing he was trying to lean our thinking to a mage.

Obviously like others said Spider=Creature and spiderman got his powers by being bit by a spider and now uses the spider powers.

I think the samurai theory is valid but not consistent. Why would Yoshi simply not use Katana from DC or a more direct (and less vague) hint? The most logical explanation i can see to justify samurai is that he was hinting at both Blue Mage and Samurai.