Number One is the mysterious leader of G.L.O.V.E. Almost nothing is known about him or what he looks like for anyone who did manage to see him face to face had a habit of dissapearing. Number One dies when Overlord implants himself in the leader's brain, even though Number One didn't realise it at the time. Overlord managed to exert enough influence over Number One to convince him to have a clone of himself made with a computer device implanted in his brain, he is named Otto.

It is not known when Overlord assumed full control over Number One but people in G.L.O.V.E. had noticed how Number One's behaviour had changed, becoming more cruel and violent in his methods.

Number One never revealed his face and always had a darkened sillouhete when appearing on video conferences with G.L.O.V.E. members.