User blog comment:ZeedMillenniummon89/Percy Jackson vs Avatar Korra/@comment-30408599-20170801133830/@comment-25620113-20170804104022

^ That's not what composite means. Even composite characters should only have what they would normally have in a fight. For example during the animated series, Lex became fused with Braniac but you wouldn't include Braniac in Lex's arsenal because its not something Lex would typically use or have easy access to.

In this example, using a composite Percy would only really give him access to feats and abilities in the films and comics in addition to the books. Even then using a composite doesn't really help him considering that pretty much all of his abilities/equipment/feats are shown in the books. While the film does show him use the ability to create weapons out of water such as a trident, he uses this ability in The Son of Neptune essentially making composite Percy a moot point.