Shall we talk about skills? I think a wraith's skill complement is a good place to start. Wraith's have ranks in Diplomacy, Hide, Intimidate, Listen, Search, Sense Motive and Spot, plus Survival at its default level (including a +2 for 5 ranks of Search).
A Wraith has max ranks in Hide, Intimidate, Listen, Search & Spot and splits the remainder between Diplomacy and Sense Motive, with enough in Sense Motive to give it a synergy bonus on Diplomacy.
It seems reasonable to give the Temporal Stalker the same.
A Temporal Stalker has an Intelligence 4 points higher so can have two more maxed-out skills. Since they used to be wizards, Spellcraft and Knowledge (arcana) are obvious picks.
That could give us:
2 Diplomacy, 7 Hide, 7 Intimidate, 7 Knowledge (arcana), 7 Listen, 7 Search, 5 Sense Motive, 7 Spellcraft, 7 Spot
Toss in our provisional ability scores, and it comes out:
Str —, Dex 16, Con —, Int 18, Wis 14, Cha 19
Skills: Diplomacy +8, Hide +10, Intimidate +11, Knowledge (arcana) +11, Listen +9, Search +11, Sense Motive +7, Spellcraft +11, Spot +9, Survival +2 (+4 following tracks)
Looks OK to me.