Other AI Options

[Laenaya]

[...] Sometimes my lif will actually do what I want and start attacking things before they start killing me, and other times I have to alt+click multiple times to get her to move or do anything worth mentioning and by that point I'm already dying. [...]

You can try searching for this (not in USER_AI, in the main folder):

function GetMyEnemy (myid)
local result = 0

local type = GetV (V_HOMUNTYPE,myid)
if (type == LIF or type == LIF_H or type == AMISTR or type == AMISTR_H or type == LIF2 or type == LIF_H2 or type == AMISTR2 or type == AMISTR_H2) then
result = GetMyEnemyA (myid)
elseif (type == FILIR or type == FILIR_H or type == VANILMIRTH or type == VANILMIRTH_H or type == FILIR2 or type == FILIR_H2 or type == VANILMIRTH2 or type == VANILMIRTH_H2) then
result = GetMyEnemyB (myid)
end
return result
end

and then change GetMyEnemyA for GetMyEnemyB. That should make Lif/Amistr act like Vanil/Filir (aka not derpy). If you don't notice any changes, you can easily and simply undo it lol

As for custom monsters, I don't think any AI's work with those and that's possibly because of the monster sprites. Nobody has ever found a final answer nor a workaround, so we gotta live with that.