There's another big thing that Susie and Taranza have in common that isn't just them both having lost someone they were being loyal to.
And I think this deserves more attention amongst Taransusie people:
They've both had a streak of being arrogant, overconfident, smug know-it-alls. They loved playing the villain in their respective games.
It may seem less obvious in Taranza's case, but I interpret that he was an insufferably smug fool during Triple Deluxe before Sectonia's death. He was on a big ego-trip as he was subjugating Floralians while dragging the false 'hero of the lower world' around with him.
Susie is more self-explanatory. She was all over the place giddying about her complicity in the conquest during Planet Robobot's events.
Now, of course, I myself headcanon that Taranza's self-esteem was heavily damaged by the loss of his queen. And I headcanon something similar for Susie in that her ego was hurt bad after accidentally killing her dad when she was trying to free him from Star Dream's influence. The smug streaks exploded in both their faces.
However, in my hcs, after Kirby introduced Susie and Taranza to each other and they got to know each other more and more, and as they've gone on to help build each other up after they've both suffered grief...
... Their smug streaks slowly start to come back.
I like to think they learn each other's level of confidence they performed during their respective incidents, and when they slowly regrow that, they admire each other's levels of arrogance. To the point they collaborate in mischief where they're so incredibly convinced that they're gonna 'own' everyone after pranking them.
Imagine the Kirby cast performing a game that's similar to Mario Kart Double Dash, with Susie and Taranza forming as one of the duos. They'd both be completely and utterly convinced that they're going to easily win the race without breaking a sweat. And to their credit, I do see Susie being one of the best drivers in the cast, albeit she'd 100% be a crazy fast driver that makes maneuvers that most others in the road would be too afraid to do.
I also envision a scenario where Susie is the head of some social media website, I guess the 'Twitter' of the Kirbyverse, Taranza has a presence on there and he can easily convince Susie to ban people on a whim, and they laugh over the power they both have on the site.
So... uh, yeah! Feel free to steal these ideas if you're a Taransusie person. I'm incredibly normal about these two characters to the point I've observed their smug behaviors in their respective games and notice that's another thing they can come together over. Hahahaha!
There's more you can do with this friendship than just their grief.
You're welcome if you enjoyed this.