There is no unit that needs Paragon more than Patty. Period.
Cash is plentiful in gen 2, so aside from Laylea needing a big cash dump, her utility isn't particularly interesting.
Ambush allows her to cheese the arena with the Sleep Sword. Theoretically she can do that regardless of her father, but Ambush requires significantly less RNG abuse.
And I don't really understand the Bargain Faval meme when Ichival is like the worst weapon in the game. Faval always uses the Killer Bow.