The Littlest Outsider

[AdamMeyers]

When you think of the tiny devil sent to tempt someone, you think of an imp. I'm curious, is there a good-version? a good-aligned little outsider that talks to you or could be used as a familiar, etc.?

And are there smaller outsiders than the imp, or is that the weakest, tiniest variant available?

Pretty much, if I want an angel and devil to sit on someone's shoulders and whisper to them Faust-style, what would I use?

[Rynjin]

Silvanshee Agathion?

I had to look this one up. Now I want to planar bind one of these AND an imp so I can have one on each shoulder.

[Martiln]

Lyrakien Azatas?

[Mortalis]

A Lantern Archon comes pretty close to what you're asking, although it is admittedly less exotic than Rynjin's suggestion.

It's also small rather than tiny. You know what? Forget I said anything.

[Silent Saturn]

The Silvanshee seems to accomplish the intent of what the OP is asking for, but the Lyrakien is CG versus the Imp's LE, making it a better foil for the Imp. Also it's roughly human-shaped, the better to stand on your shoulder and try to persuade you to the path of good.

Now I want to see one of these and an Imp argue about morality, but on the Law/Chaos axis.

[Mikaze]

Cassisian Angels to complete the good set. :)

Small rather than Tiny though.

I really wish the Moingos were in Pathfinder. You could have them debate Pi VS Evil with imps.

[Wolf Munroe]

All of the options below can be gained with the Improved Familiar feat with an appropriate alignment and enough levels. This list only includes Paizo first-party options. (I may have missed some.) Note that the Quasit entry in the link doesn't indicate the rules for gaining one as a familiar, but they are created as familiars, according to the flavor text.

Good tiny outsiders that can be taken as familiars:
LG: Harbinger Archon is an LG tiny outsider (archon).
NG: Silvanshee is an NG tiny outsider (agathion).
CG: Lyrakien is a CG tiny outsider (azata).

Neutral tiny outsiders that can be taken as familiars:
N: Nosoi is an N tiny outsider (psychopomp).
LN: Arbiter is a LN tiny outsider (inevitable).
LN: Shikigami is an LN tiny native outsider (kami).
CN: Voidworm is a CN tiny outsider (protean).

Evil tiny outsiders that can be taken as familiars:
LE: Auger is an LE tiny outsider (kyton).
LE: Imp is an LE tiny outsider (devil).
LE: Raktavarna is an LE tiny native outsider (rakshasa).
LE: Spirit Oni is a LE tiny native outsider (oni).
LE: Tripurasura is an LE tiny outsider (asura).
NE: Cacodaemon is an NE tiny outsider (daemon).
NE: Doru is an NE tiny outsider (div).
CE: Cythnigot is a CE tiny outsider (qlippoth).
CE: Quasit is a CE tiny outsider (demon).