Sangamon Taylor (toxicspiderman): Probably Tom Akers. Ex-Navy SEAL, mid-thirties, shoulder-length hair. They worked together on an operation, and then there were spoilers, and it would freak him out more than someone he was super close to because he's more likely to really believe it's Tom. His girlfriend, Debbie, would also work if he's already seen Naraku and knows it's a trick. (I can't seem to find a description of her; if it comes up ask and I'll reread or headcanon you one.)

Taura (ninelivesonce): Miles Naismith. Four foot 10, a little bit hunchbacked, dark hair. Her Admiral and lover.

Lana Skye (fourstonewalls): Most of the canonmates I'd suggest are at Damned; if Ema isn't in the party even though she's around I'd still say go with Ema. And if Ema is in the party, go with who will impact her.

Rose Lalonde (lovecrafty): Her Mom.

Edit: for the obscurer ones, just poke me for any canon details you need; I will tl;dr forever.