Undrave
Legend
Okay, list of classes, and their dip feats:
- Artificer: Artificer Initiate (Good feat, maybe a bit OP, some people want an infusion feat)
- Barbarian: There's nothing here. Maybe they could make a feat that gives something like Brutal Critical or Reckless Attack.
- Bard: Magic Initiate (Bard), maybe Practiced Expert and nothing else. (Some have recommended Bardic Inspiration. I think that could work, but would be overshadowed by Lucky)
- Cleric: Magic Initiate (Cleric), Ritual Caster, nothing else. (Some have recommended Channel Divinity. I think this would work, but they're going to have to decide how broad it is.)
- Druid: Magic Initiate, Ritual Caster, nothing else. (Some have recommended Wild Shape. To this, I disagree. Druids own wild shape, no one else can have it. Maybe a feat that makes you a shape changer)
- Fighter: Martial Adept, Fighting Initiate, the armor/shield feats could fit under here (We need nothing else, IMO.)
- Monk: Absolutely nothing (right, isn't there nothing? Maybe Tavern Brawler? Any thoughts on a monk feat? Give Ki or something, like MM Initiate?)
- Paladin: Nothing. (Maybe a possible Channel Divinity feat, or Lay on Hands. I'm indifferent to this)
- Ranger: Tracker (We don't really need anything else)
- Rogue: I guess you could count Skulker and Tandem Tactician, maybe Practiced Expert (Some have said a Sneak Attack feat, I don't see the need for it. Maybe a Cunning Action feat)
- Sorcerer: Magic Initiate (Sorcerer), Metamagic Initiate (I don't think we need anything else. Maybe some more planar feats, but those don't really belong to sorcerers)
- Warlock: Magic Initiate (Warlock), Eldritch Adept (We don't really need another one, but I could see one that gives another spell slot of 1st level)
- Wizard: Magic Initiate (Wizard), Ritual Caster (We don't really need another one)
I think the Barbarian, Monk and Paladin are really the ones without any feat representation. Magic Initiate can shoulder a lot of MC flavor (same with Ritual Caster).
For Barbarian you could even include 'durable' as a Barb featsince it boosts HP

There's always the option to combine Monk and Barbarian in an unarmored defense feat that lets you do the CON or WIS to AC (based on what stat you bump?)
But for Monk I could see you getting 2 ki points and the ability to use Dash, Disengage or Dodge as a bonus action by spending them. It would, in turn, give more Ki to the Monk. Maybe throw in an extra 5 feet of movement?
Paladin, I think a generic Channel Divinity would be good. Gives you an extra use that works for both Paladin and Cleric, and the option to spend your Channel Divinity on... I dunno, a 1 turn buff to your AC or something like that? Something that evokes the heavy plate armor of a paladin?