Ishido

Oki Ishido is the Grand Sage of Centrum, The Sage Islands. He uses Mind Gen: Gen Copy to copy the Gen of others and, as a result of his vast knowledge of most Gen, manipulate it better than its original user. He is the youngest Grand Sage to have ever been appointed, aged 34.

Xuhang Fu
Xuhang is resentful towards Ishido's appointment to Grand Sage as he feels it weakens the Sage identity. Furthermore, Ishido predicted instantly that Xuhang would never achieve Water Gen.