Spoilers:
DK attains a SSJ5-inspired Kong Bananza, as a power up against the final boss.
by SSJ5, i mean it's really just a gag on Beast, UI, and Gear 5. He runs fast, can charge souped up projectile arcs, slowmo dodges, and keeps on a bright smile.
K. Rool is not the final boss but he was the co-konspirator. He got tied up with the same shit Pauline got into.
and a huge spoiler:
Red was raped at Mt. Silver on the fridgid fall of '99