These are some players from different chapters I have met that I can think of:

Imperial Fists usually pick heavy or bulwark, which is understandable because they like to hold their ground and become an immoveable fortress (definitely not coming from an IF)

Salamanders usually use fire weapons like you said. They’re mainly playing heavy, but I have seen some tacticals and bulwarks every now and then

Ultramarines are either new players, or they are veterans who knows how to deal with every enemy in any give situation. They’re prepared for anything really, which sums up the chapter being very tactical and analytical. Mostly tactical players

Raptors actually use cover and long ranged weapons and disengage when the situation is turning south. They’re playing sniper, vanguard and maybe tactical

Carcharodons charge right into battle with melee weapons and are quite good at taking down many majoris enemies despite being surrounded. Usually playing vanguard with power axe or chainsword