It's recycling
If he has the Fenrir fruit he would quite literally be a copy of Yamato to a degree
Both wield a blunt weapon
Both have a strained relationship with their parents
Both were locked up for years
Both deeply admire a pirate that came to their country once or twice and never again, longing to sail with them (Ace for Yamato, Xebec for Loki)
Child of a notorious top tier and ruler
Both fought their father
Both treated as if they're a monster for their lineage/traits (Kaido telling Yamato she's an oni and she could never be friends with humans, Loki being shamed for his demonic eyes and also being abnormally huge even compared to other giants)
And in the case Loki has the Fenrir fruit, they'd also both have mythical canine fruits
I may be stretching a bit here but my overall point remains. Oda uses a lot of the same plot lines and traits for a fair amount of characters, but this is only expected as it's one of the most formulaic mangas ever lol.
Almost every arc is about freeing a place from a tyrannical ruler and there's always certain archetypes of characters such as Kyros and Inuarashi