Chara

http://undertale-au.wikia.com/wiki/Chara/FandomTale

Corly, also known as the first mobian or the fallen mobian, is the first Mobian to fall into the Underground. They have the Fallen role.

Apperance
Corly is an mobian wearing A striped green and yellow sweater,brown pants,grey shoes.

Theme link..
Darkness Strike Back Credits to NyxTheShield??i guess??