Killi's a trident wielder & archer who relies on his Devil Fruit a lot, he wouldn't be offended about not being Shams' best student 💞 He's not a swordsmaster, he'll admit that! Not his circus, not his monkeys 😋
Speak of the kirin, I have a lot of HCs circling around Killi's weird behavior that all connect back to him never being on the surface before (or at least, not remembering ever being on the surface)
He's likely the youngest/newest Knight due to his frantic & people pleasing behavior throughout the entire Elbaph mission, he's apparently never seen a fishman in person, he's shockingly willing to acknowledge mortals strengths when they display them, he canonically has pluviophobia (fear of rain), and he's the only Knight we've seen who actively wears a bubble (plus only Noble overall who wears a respirator)
So, if Killi were to be on Sabaody, it'd be him clinging to Gunko & Mjosgard while muttering about how he can't believe he's going through this just to see Shamrock's stupid face <3
All three of them saw Shams' wanted poster and decided they need to track the dumbass down for a Talk, so that's why they're even out on vacation ¯\_(ツ)_/¯
~🥜❦ (putting this rant in your ask box so I can reference it later when rambling about my beloved killingham 💞)
Yeah, he wouldn't really be offended, would like to play fight her and have a lot of fun with it. And it's fun to experience other peoples' circuses from time to time.
Aside from a chance of Shamrock it would be the worst day of his life even if Sabaody is designed for celestial dragons to enjoy. He would panic the moment one of his companions isn't around and forget all about it once he spots his favourite older brother (sorry Marco, you're not as cool as Shamrock).
My thought is he'd be allowed to go to Sabaody due to its proximity to Mariejois and high marine presence meaning less of a chance of things going wrong. It's practically part of Mariejois, at least parts of it.
Bubbles from the ground would have him nearly fainting and refusing to walk on the ground for a while.
"I can't believe I let you two talk me into this. This is the worst place ever. I hate this." All the while getting a piggy back ride from Gunko, so silently memories it all to tell Shamrock once they find him.
I bet Mjosgard asked for them to be his bodyguards to get them there. Maybe someone messed with nobles and he insisted he needed proper guards for his very important business.