Fire Emblem - This should be fun.

Kinda scrawny early Path of Radiance Ike singing "I Can Go The Distance" from Hercules
Gaius singing "One Jump Ahead" from Aladdin especially the reprise.
Arvis or Julius singing "Hellfire" from Hunchback
and for lulz Robin singing "Kiss the girl" to Chrom and any one of his possible wives.

Sigurd singing Hellfire.