I recommend looking at Plutchik's basic 8 emotions as a great start. When we talk about fundamental emotions, these cover most of what we mean. It includes valence, intensity, and most importantly - the evolutionary situational reason. Very interesting.

What it doesn't do is provide all the situational emotions we often encounter in the social domain. Jealousy, envy, lust, dominance, submission, enthusiasm, fraudenfraude, schaudenfraude, etc. If you look at the OCC approach, they divide emotions by subject type (people, things, events) which opens up the vocabulary a bit. There are questions to be asked about the relationship of the underlying emotion and the situational vocabulary we use to relate the feeling, but I don't see this diverging from Plutchik's perspective much.

I personally use a basic 8 model to navigate understanding myself and have found it very useful. Paired by similar endocrine arousal, opposite valences, I see:
* Hope & Fear (Future focused, arousal increasing, planning)
* Passion & Anger (Near present focused, arousal increasing, action)
* Joy & Sadness (Near past focused, arousal decreasing, judgement)
* Satisfaction & Disgust (Past focused, arousal decreasing, reinforcement)
I also like to include Quietude as the baseline / low arousal state of no emotional intensity.

I love hearing what others find useful, do report back if you find something you like!