Wahu's Links
Wahu is closest to Grudge in their party. Their evil aura has no effect of Wahu, because Wahu is too pure, it probably negates it or something. They've never found Grudge scary.
Grudge is closest to Wahu in their party, due to Wahu being the only one to reach out and attempt to make amends after killing Grudge's family. Grudge has picked up a mentor role for Wahu, just as Kodulus did for them.