is silver the hedgehog a japanease character insted of a sega character?

Nope, definately Sega

What do আপনি mean দ্বারা Japanese character?
Cus if আপনি mean SEGA of জাপান then i don't think so.

He's made দ্বারা sega and sega is a japanese company and sega of জাপান came up with silver so he's both but আরো of a sega character