I have tried to make a Planeswalker custom homebrew  but the only way i can think is to do a subclass for each standard class like Green for druid, red for sorcerer etc is there anyone that has done a single class Planeswalker

When you say "Planeswalker" are you talking about the MTG kind?

Yes i am there was someone that has done a homebrew for it and i am trying to make a subclass for Green Planeswalker under sudbclass for Druid

I've thought about this and have used the Unearthed Arcana Giant Soul as a model. And giving them a free [Tooltip Not Found] at level 14.

With each color availible per subclass feature, and each representing a different style of play:

White- Team Buffs/ Healing

Blue- Control/ Deception

Black- Necromancy/ Healing

Green- Self Buffs/ Minionmancy

Red- Tank/ Damage

As a starting point, plus you can mix and match for "multi-colored" Planeswalkers. Like Sarkhan Vol and Ajani Vengeant.