Feather Face

Stack into the soup boy in the same room as Tiberius.
Stack into the pigeon and you'll be able to land on Tiberius's head, causing him to freak out.

Hairy A'mor

Head up to the Dining Car and stack into the doll with the train whistle on his head.
Use the whistle to wake up the measuring doll that is sleeping on the couch.
Stack into the previously sleeping doll stack into him, then head over to the other end of the table where you'll find a doll with messy hair. His special ability is a Man Hug.
Next, stack back into the measuring doll, and then stack into a large female doll so you can make it past the female only room.
Once you reach the room where Tiberius is, stack out until you control the measuring doll.
Use his ability on Tiberius to get him to take the armor off.
Next, use the doll with the Man Hug to hug Tiberius into submission.

Tickle Duster

Head up to the floor above Tiberius and stack into the maid with the giant feather duster.
Head back down and use the feather duster to tickle Tiberius into submission.