Interesting - I've not explored anger too deeply but it feels like it often originates from fear.
There's also an anger that appears while filled with love & in flow. It so rarely occurs & dissipates so quickly, that I find it difficult study or judge.
On the outside it appears as regular anger, indistinguishable from anger originating from fear. Internally it feels lighter, almost playful but the pain it causes externally is very real. A wise observer might describe it at was righteous anger.
Ephesians 4:26-27
Be angry, and yet do not sin; do not let the sun go down on your anger, and do not give the devil an opportunity