Favorite headcanon of them? My mutual loves them, how much out of 10 do you love them?
And would you pair the Dejiro with any other straw hat?
If you're asking about the ship zojiro, I love them 1000000/10, in fact it's the only ship I actively ship and try to seek out more people to obsess over it😇I also run a server dedicated to them, have written over a 100 stories with my friend and have drawn approximately 400 pictures of them!
It's very difficult to choose a favorite headcanon.... since I've written a list of over 60 headcanons for them right here https://x.com/SnuggleFloofles/status/1974059059281326588?s=20
But if I had to choose, my favorite would be the idea that (only) Zoro's wanted poster on Wano was drawn by Denjiro. It was the first major sign of how much Denjiro adored Zoro's features, since he spent many frustrated attempts to capture the perfect amount of dignity, intimidating aura and resolve in them. (The idea is that they met way before the incident with Yasuie and became frequent battle buddies - with shy benefits).
Denjiro never told Zoro about this, but Zoro probably noticed when he watched Denjiro paint somewhere down the road. He wouldn't mention this discovery, but it would leave him feeling all smug, knowing his samurai treated his image with so much care - and was already down bad for Zoro when the two of them still considered each other total nuisances.
As for other strawhat pairings, I probably wouldn't of my own accord 🤔 but I also only started shipping Zoro and Denjiro after roleplaying the two with someone for a long time. (Can you imagine, I used to feel pretty neutral towards Zoro! He was always cool, but that's when I started to really feel for him...!) So with enough chemistry, a lot is possible! Denjiro is a smart guy who highly admires those who break the mold, which describes basically all of the strawhats LOL so let's see...
-Luffy could be in the cards for his resemblance of Oden (although I'm pretty sure Denjiro actually has a more complicated relationship to Oden than it seems #abandoment issues)
-Nami for how witty and good with finances both of them are
-Usopp for his fresh perspectives on what it means to be a brave warrior
-Sanji for their (as I imagine it) shared stance on chivalry and standing up for the weak
-Robin and him share an insatiable thirst for knowledge and truth (in fact, I kinda consider Denjiro a polymath, because he was constructing buildings at maybe 7 years old and teaching adults all kinds of things😭)
-Franky and Jinbe for the same reason that all of them know what it means to lead groups of people and take responsibility for them even if it means they gotta bare their neck for it
-Brook because loss has harshly defined both of them, but they make the most of things, knowing certain duties of theirs are not yet fulfilled. And Denjiro enjoys to tease people with being spooky...! Could you imagine him doing that to Brook and he gets all afraid, wondering where some ghost is hiding LOL
TLDR; I honestly don't know, it's hard to say without chemistry 😂