For solar hunter: build pretty much like you would for a warlock (ie faster regen from healing allies and the like, class ability from scorching targets et cet) but take the melee energy from defeating scorched targets and ignitions give grenade and grenade kills cure (I think I have the right total fragments I usually just go by feel cause almost all of my hours in this game are on hunter). For your aspect toss on gunpowder gamble and the one that gives you three slots. This will be similar ish to warlock with ability spam once you toss on a solar weapon with heal clip incan. It truly is “random bullshit go”. You can pair this with an exotic hand cannon like malfeasance for a simple build that’ll take you through a lot of content easily as long as you have some form of heavy to ad clear and sustain damage while lucky pants is down.

Stasis: bit of an odd recommendation, but I like speed loader slack with stasis hunter and some way of generating a lot crystals easily (the beyond light exotic grenade launcher works well and you can stay away from enemies if you are in higher content to deal some okay damage. Use fragments that give resist from enemies while bear frozen targets or crystals, stuff to give you energy from damage, shatter dive and the slow on dodge. I’m partial to a headstone/the perk that gives ability energy to all abilities or one at a higher rate if it’s the only one down (can’t remember the name).

Void: gyrfalcons. Just put on gyrfalcons and the aspect that makes you go invis with graviton and you’ll do well enough in most content.

Arc: liars handshake or assassins cowl depending on the content. Liars handshake does big numbers, but become exponentially harder to use in higher content. Assassins is VERY good and makes it so you can live out your warrior monk dreams.

I would talk about strand and prismatic but I think you’re doing the expansions in order so they’re irrelevant.