I'll start:

- Urza's dismissal of mana and being tortured for years by a creature.

- Sorin's opposition to aligned vampires and now aligned angels and former co-worker.

- Jace's misshaps with other planeswalkers and a guildmaster

Elspeth-couldn't use and it cost her her life. She was trying to form a mana bond with a white source and could only think of a forest grove.

I don't know if I am doing this right...

- Serra eschewing mana in favour of her ultimate fave , only to be pwned by it in her two appearances (Phyrexian Invasion in her realm. Baron Sengir mocking her at her worst in Homelands)

Elspeth has several green associated cards

This. I don't think there's any other planeswalker that embodies as well the conflict between and , let alone being victimised by it.

She's been quoted or depicted in them but I dont think we've ever seen her actually use a green spell. It could have potentially been a case of color screw, she had the spell but couldn't focus on the right mana bond.