So I’ve already put money into Brawl Stars but if I unlock Crow in a box can I make the Run or not ?

Yep, just be sure that crow has 0 trophies.

Yes you can

Of course you can, The rule "Must be free to play" is only during the run

if i was doing a longer run and I found away to get brawl pass and I didn't make any microtransactions that's fine yeah?

Yes, ff you win enough gems in boxes to unlock brawl pass without pay, you can buy it

I swear if he does a brock% run and gets brawl pass... Well played

I swear if he does a brock% run and gets brawl pass... Well played

I don’t know if using the Brawl Pass really more works for Brock% Jessie%

Yeah to get more brawlers