Step 1

File > Document Setup > Edit Artboards

Expand the artboard to dimensions that fit two characters on the top of the board and two underneath.

Object > Select All (Command-A) to select all the elements. Then Object > Expand Appearance to transform the strokes into filled shapes. This will allow you to resize the illustration to any size without losing quality.

Command-G to Group the elements together. Then Duplicate the group, in order to create three other copies of the mascot character design on the artboard. Select the group, hold down the Option and Shift keys, and drag to copy and constrain your selection.