Alright ill try to help you.
1. How do I give it a "spark" attack that causes paralysis? I'm not sure if I want mild but full-body or severe but targeted paralysis yet, so I need to know how to do both. Also, I would like it to use the head to attack, like Headbutt (that may end up being a separate attack, so it can use Bite, Scratch, Spark, and Headbutt).
2. Is it possible to change the relative sizes of bodyparts? Pikachu have large ears and tails, and I want that to be reflected in its file.
3. How do I allow it to grasp objects with its front legs and/or its mouth?
1. You would have to make a vemon template, I recomend that you just take the one from the Giant Cave Spider and modify it by changing the names/severity/probility.
But ill give you a few ideas. To lazy to change the names
Feel free to make it so it doesent work ever time if you want.
[USE_MATERIAL_TEMPLATE:SPARK:CREATURE_EXTRACT_TEMPLATE]
[STATE_NAME:ALL_SOLID:frozen giant cave spider venom]
[STATE_ADJ:ALL_SOLID:frozen giant cave spider venom]
[STATE_NAME:LIQUID:giant cave spider venom]
[STATE_ADJ:LIQUID:giant cave spider venom]
[STATE_NAME:GAS:boiling giant cave spider venom]
[STATE_ADJ:GAS:boiling giant cave spider venom]
[PREFIX:NONE]
[SYNDROME]
[SYN_NAME:giant cave spider bite]
[SYN_AFFECTED_CLASS:GENERAL_POISON]
[SYN_IMMUNE_CREATURE:PIKACHU:ALL]
[SYN_CONTACT]
[CE_PARALYSIS:SEV:25:PROB:100:RESISTABLE:SIZE_DILUTES:START:5:PEAK:5:END:1200] This will give a full body instent mild paralysis with the larger the creature the worse the paralysis.It also lasts a in game day. But if the creature is too small then the creature will suffocate so watch out.
[USE_MATERIAL_TEMPLATE:SPARK:CREATURE_EXTRACT_TEMPLATE]
[STATE_NAME:ALL_SOLID:frozen giant cave spider venom]
[STATE_ADJ:ALL_SOLID:frozen giant cave spider venom]
[STATE_NAME:LIQUID:giant cave spider venom]
[STATE_ADJ:LIQUID:giant cave spider venom]
[STATE_NAME:GAS:boiling giant cave spider venom]
[STATE_ADJ:GAS:boiling giant cave spider venom]
[PREFIX:NONE]
[SYNDROME]
[SYN_NAME:giant cave spider bite]
[SYN_AFFECTED_CLASS:GENERAL_POISON]
[SYN_IMMUNE_CREATURE:PIKACHU:ALL]
[SYN_CONTACT]
[CE_PARALYSIS:SEV:100:PROB:100:RESISTABLE:LOCALIZED:START:5:PEAK:5:END:1200]
This will cause sever localized paralysis again lasting for an in game day.
You need to add in a new attack for this to make this work. But will use the BRAIN to do this attack
[ATTACK:SPARK:BODYPART:BY_CATEGORY:BRAIN]
[ATTACK_SKILL:CONCENTRATION]
[ATTACK_VERB:zap:zaps]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PENETRATION_PERC:100]
[ATTACK_PRIORITY:MAIN]
[SPECIALATTACK_INJECT_EXTRACT:LOCAL_CREATURE_MAT:SPARK:SOLID:100:100]
For the Headbutt you will have to add in this.
[ATTACK:HEAD:BODYPART:BY_CATEGORY:HEAD]
[ATTACK_SKILL:GRASP_STRIKE]
[ATTACK_VERB:headbutt:headbutts]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PENETRATION_PERC:100]
[ATTACK_PRIORITY:MAIN]
This should make a headbutt attack.
2. Yes it is this is the dwarven liver resize.
[RELSIZE:BY_CATEGORY:LIVER:300]
To change the ears/tail just replace LIVER with the respective category token and the size. To find that look in the body raws.
3.To grasp things one thing you can is make a whole new body set and add in the GRASP token to the body parts you want to be able to. Or i think you can do that same way you resize body parts, but i dont know exatly how you do that.
How this helps.
Oh and I looked over the raws you posted. And your spark attack basicly is a body slam lol.
Also it will be smaller than a kobold lol. Might want to make it larger.