when I was in grade 1 , I studied in London .. cuz my dad went to university there..
only one year, but It helped a lot..
when we came back to UAE .. I went to a private school, but I chose the arabic section.. I wad sick of english already..
I don't think my personality was affected in anyway.. cuz I did great in Arabic too in the following years..
the point is.. when kids get exposed to other languages in early years.. they learn faster..