Sonic

He's happy but always glares at him/Her

Tails

He's skeptical about you two

Amy

Super happy

Egg man

Skeptical is an understatement. He's happy but can't even believe that you found a special someone.

Infinite

He is looking at them with anger in his eyes. Even with his mask on

Silver

He kinda cussed him out when you're out of the room

Blaze

Shes calm but on the inside shes fangirling and in raged.

Shadow

He was stareing holes in to them. It was awkward with them.

Knuckles

He punches them (if you have a BF)and says "Better treat them right"

Rookie

They hold you close and stare at your Bf/GF.

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Edit
I forgot to tell you you're about 18 years in this one. What's next is How you find out.