Heaven Shall Burn

Oh, and the guessing game:

that white-haired mister who was smiling every time - Ukitake

Exactly :)

that serious mister with a scarf - this one's too easy, Byakuya

That's right!

speaking and laughing strangely, with a scary mask on his face. - Gin

No, it's Mayuri :)

the man with a moustache - Yamamoto? Not realy sure about this one.

Actually, it's his fuku-taichou - Sasakibe Chojirou. But the trace of reiatsu comes from Yamamoto :)

2/4 then

There are also some Bleach characters in Tousen's stories:

hedgehog and a ball of pink wool - Zaraki and Yachiru
dog and the Moon - Renji and Byakuya

And of course "wolf and his friend" - Susumu's parents :)