Didn't have all of this but my very first is the Megazord from Zyuranger series.

Still remembering that I bought it from "The Store Supermarket" in Kota Bharu, Kelantan back in 90s.

Remember that we call all of these as Power Ranger in Malaysia, that's it. 

Sharing the moment through this youtube video. A video from the Youtube channel wotafa/ヲタファ

So which which was your very first Sentai robot back in your childhood's day?