Well I once had an Yamaha XT250x which is about a Serow (a kind of mountain goat) and I think it are good bikes for off roading. A bit less for on-road riding due to low on power. Is (or was) very popular in Japan. As far as I know officially never sold in Thailand so all sold here are grey-imported or spare-part-imported.
My friend rented a Serow for 3 weeks from Flamingo in Hanoi. He liked the bike for off-road but as mentioned above it was quite underpowered out on the road. I was on a YBR125 and could run away from him at will.