That's one skinny looking Sabin.

Also, this is the first time I've seen Terra refered to as "Tina". Is there some localization that I missed, or was that her original Japanese name?

Translation gone into the wrong direction, Tina is her original name, but someone bungled up the kanji whom made up her name, thus Terra.

Actually it was because Tina sounds much more rare and unique in Japan, while in America its a relatively common name. Ted Woolsey used the name Terra to preserve this uniqueness and rarity.