That reminds me. For the first mates and the YC1 Oda really takes great care of them as well.
They imo are the second group in terms of the combinations I mentioned earlier. Oda really goes above and beyond for them. (Rayleigh, Zoro, Beckman, Katakuri, Marco, King, Shilliew) they are always the standouts in the crew a lot of times even outshining the captains. Which of those designs are ever goofy or not threatening? He goes out of his way to make them look and act like complete badasses.
This is why I don't even need to see Greenbull to know he's in good hands, and I didn't need to see King to know he'd be an amazing design as well. Oda is very cautious when designing these two groups he leaves his wild creativity loose for other groups (warlords, yonkou, other commanders etc), he doesn't dare experiment loosely with these guys.