[3.5 Class] The Familiar

[Prime32]

Neat idea.

On races, I'd suggest allowing Improved Familiar choices with an LA equal to half the minimum caster level, rounded down. For instance you could be an imp for +3 LA, but only if your master was lv7 and had the feat. Or rather than LA, you lose 3 familiar powers (effectively nulling 3 levels of the class without the problems inherent in LA).

Abilities like Master's Power and Bigger Than You Thought having effects based on the level you took them, will result in everyone taking them as soon as possible. Better just to say "once per 6 class levels" rather than "you must wait 6 class levels after taking this".

Master Meld should specify that you don't need to be the same type as your master, and which type you end up.

Can familiars multiclass? If not, the line "For any affects that depend on monster HD, instead use the Familiar's class level." in Something Other is unnecessary. If they can, why not just give them Monster Hybrid as a bonus feat? I'm also not sure why a Construct familiar can't take levels in Construct classes.