Brother Kojo is the priest in charge of the Clock Tower. When the player first meets him, the clock has stopped working, due to the fact that the four cogs that keep the clock running have been taken. He also makes watches, but due to the clocktower being so near to Ardougne no one actually needs them, so he has far too many. As a result, he will happily give the player as many as they need for free.
He is involved in a Clue Scroll (hard) by giving the challenge question, "On a clock, how many times a day does the minute hand and the hour hand overlap?" The answer is 22.