Was going to mention Coppelius.
Something about Ride/Fly with Me is that it doesn't necessarily come on the scheme runner itself but it can enable other generically fast models to get a head start on scheming. If you hitch a high Mv model along in turn 1 before they activate, they're 6ish inches further up the board before they start their objective run.
And I agree that Wicked Dolls, though I haven't fielded them yet, are probably the best cheap scheme runner because of Creep Along (can similarly get a head start by moving towards a friendly model that already activated) and Stealth, which means the opponent actually needs to go kill them, they can't just pop them at range.
But the thing I agree with the most is that Tots are useless now. They really ought to have Leap or at least Ambush or even Creep Along to regain their place as the Nephilim schemer. Bump their cost if you have to, but they are utterly useless and I would never hire one now, where I would hire 1 or even 2 in 2E. Maybe they were weakened to account for Grow being an always-available tactic now, but honestly as much as I love Grow in 3E, who's having much success growing Tots into anything? They die to nothing, they don't have Flight like the rest of the crew, and their Stat 4, 1/2/4 attack is worthless.