The Monkey is not usually available in Monkey Assistants but there is a way to select the monkey. Select a different mode first (eg Deathmatch) and select the Monkey as your character. DO NOT START THE GAME! Quickly, after the Monkey does his taunt, go back to Mode select. Select Monkey Assistants. If you go on to the Select Character Screen it will show the Monkey but have Not Available at the top right screen. The scroll bar shows you\ have selected Harry Tipper but this is wrong. Ignore this and press A. You will now play as the Monkey on Monkey Assistants