@slyflourish one of the only good things to come out of the 5e Spelljammer books is the attitude table. I really like to use it in random Encounter tables.

Some example rolls: 1d6, 1d10, 1d12, 2d6+3, ...
Just take a look at the probability curve. Do you want even distribution? 1d12
More scewed to indifferent? 2d6
Only indifferent and friendly? 1d8+4