Well it is not completly 1st attempt, but its the first time trying on other character's then the existing one.

Short story:

Iam Wills and Faiveth went through a random portal in their dimension, as they arrived they look among themselves and saw that their bodies and accessories has changed. They now have gloves and shoes, and lost their pants. They seem that they were on some sort of ruins, with a giant emerald behind them. Then seconds later, they saw an angry red echidna walking towards the top. It shouted that we are "Eggman" spy. We mentionned that we aren't spies, and we don't know this "Eggman". The echidna said still with anger to get away from the "master emerald". Then suddenly in a flash, a blue hedgehog appears telling his friend "Knuckel" the echidna to calm down. The blue hedgehog introduced himself: "Sonic" the hedgehog.