Table and Format, its all on the Guide to Homebrewing in the forums section.

Aside from some obvious problems, like Ghost Touch at level one (thats giving your character a weapon thats 1250 gold at level one) the progression for its...not that great. +3 at level 14, not only that but you can only add a +1 one on to it, this ability is sadly underpowered.

Lets get to the rest, so flavor and the like. Why any nonevil? There were evil Shinigami in the series, plenty of them actually. Alignment restrictions are never good, let alone ones that are rather arbitrary.

Why do they all cast spells? Maneuvers are by far the best option, Kido users should be a PrC.

"Spirit Weapon" is way to broad, and again they should be using maneuvers, it fits the style of a Shounen manga/anime far beter then vacian spellcasting(Power Points fits better for actual magic but thats not the topic). Make them choose a weapon at level one they apply weapon focus to, and only that weapon. As they progress they get more feats for that weapon to make them better in combat with it, look at the chart in OA Samurai if you want them to be able to add enchancment bonus's to it.

Why evasion for all of them? Why Undead Slayer. Hallows are arguably not undead. Give them bonus's against spirit creatures, as its an actual subtype and is more in style with the series.

Not trying to be mean, trying to give an honest PEACH here. As written they arn't really Shinigami from any setting actual myth or anime/manga. As written they are vastly underpowered.