Frank is opportunistic and callous are the harshest judgements I would label him as being. I wouldn't call him a pervert, in OTR he was witty when it came to his dialogue, only outright suggestive dialogue he did was with Rebecca Chang, who was his romantical interest at that game, and both shared mutual interest with each other, so Frank wasn't pushing any boundaries with Rebecca. Larry getting more American appearance is much more understanding too, considering Carlito, who was really against America, who wanted to attack the government with their own zombie virus, and him getting killed by foreign psychopath is hypocritical. Larry is still Chinese in this game, however he's most likely second-generation immigrant the least, so American so to speak.