Arias became the regular third baseman in his first year with the BlueWave, and was the team's best power hitter, hitting 38 home runs in 2001. He was a slow but solid fielder, and had a strong arm. Arias was a very streaky hitter, and had a very low batting average with runners in scoring position. He signed with the Hanshin Tigers in 2002, and hit 38 home runs with 107 RBI in 2003, contributing to the Tigers' league championship. He also won a Golden Glove award at first base, and the Best Nine award that year. He left the Tigers after 2004, as they dropped him as they were making a bid to sign Yokohama BayStars foreign star Tyrone Woods, before the Chunichi Dragons got him, and signed a minor league deal with the Washington Nationals in 2005, but was cut at the start of the season. He played in the Mexican League for the rest of the year.
Arias was signed by the Yomiuri Giants in June 2006, and made his debut with the Giants in July as an outfielder. He was unable to repeat his previous success, and was demoted to the minors after playing 17 games. He hit only .167 his last year, and was cut at the end of 2006.
In 639 games in NPB, Arias hit .259 with 169 home runs and 436 RBI.