I think it’s a fair comment that a character creator probably is going to cost a bit more than preset heroes just for the fact that you can mix and match the bits you like, equally I would say try and restrain yourself from throwing on too many extras - it can be tempting but they really do add up. For example if you stripped out archmage, regenerate and ward you’d be at the same price point as the fungoid.
I had a go at at Moonclan shaman on a Squig, I’ve taken a few liberties like swapping in a random movement stat (there’s currently no way to do that but it’s arguably a nerf vs M8”) and exchanging the Grot keyword for Squig to make it fit with the GSG tome mechanics better.
Grot - 3
mage staff - 1
Mage - 0
mounted Beast - 8
fly - 4
+1 attack to Maw - 1
Vicious charge - 1
total = 18
I don’t feel great about it costing 180, tbh I think that fly is kind of overvalued on him but it’s a standard rule for squigs so I threw it on anyway. Maybe if fly cost 4DP for a gargantuan and 2DP for a mounted beast that would be better? Having said that I think he’d actually be reasonable value for 140 without fly as a wizard who can keep up with my squigalanche.