
Secret of Mana is probably the best place to jump in because it's readily available on Virtual Console, though the best way to play it is with two friends or siblings. That's a blast. Final Fantasy Adventure on the Game Boy, which is actually the first Mana game, is pretty good. Legend of Mana on the PS1 is a love it or hate it kind of game. I think it's hard to get into The rest are kind of hit or miss, unfortunately, except Seiken Densetsu 3...but like you said, it's never been officially localized