GU has all 4 games bundled under .Hack//Gu Last Recode it includes original 3 games plus the final one that was made specifically for the bundle. It's available in PSN store. As for first 4 games, unfortunately not redone so if you're like me and your nephews trashed your PS2 before beating it, my condolences T_T. Had to YouTube the end because it happened while I was trying to beat last boss.

Tsukasa isn't a healer though? If you played any of the games you'd know there aren't actually any healers in it and most abilities are tied to what equipment you use. This is known via Elk who is the same class as Tsukasa. Also Tsukasa isn't the only one trapped, the 1st 4 games came with a 4 part anime dealing with what specifically was going on outside the game with that situation.