Euro, Yen, Dax, Nikkei 225 on Singapore. It just depends on the given day and the time at which you refer to. That's a pretty wide time frame you are referring to. That's a good starting point though.
DAX liquidity really isnt great. If you want liquidity then the bund (gbl) and estx50 (like the dji for europe) have much better liquidity than the dax or even the eurofx during the european morning.
And the SGXNK (singapore n225) has much better liquidity during the asian period. HSI is also fun during that period (my poison of choice).