Is there possibility for one to make realtime online blender games? Tried looking up the net but info very scant.
Depends on what you mean with "realtime blender online games".
Blender is a model editor and not sufficient to act as a game frame work.
The BGE is a full fledged game engine and can be used to create "realtime games".
There is no build-in network support. You can communicate over a network via Python. This means you have to implement it by yourself (strong Python and network skills required).
Other Game Engines
You can use Blender to create assets to serve a game running on other game engines. It is up to this other engines to provide network support.