Things that make sense some characters could do. Possible perks.

[Wonz]

WX-78

• Metal detector: once a few days being able to locate a place on map where you can dig in order to find buried gear.
• Overcharge: Can charge your bar second time, once full you can spend it to use special abilties:
  • Combat/AOE damage: Unarmed punch will release powerful electrical attack dealing big damage to main target and creating electricity arcs between several enemies around dealing less damage than to first target.
  • Short burst of extra speed: (I know he's fast already) Right click yourself unarmed to trigger temporary effect similar to being hit by lightning before rework.
  • Overdischarge: Eating nitre will cause you to produce large area explosion that will deal you 50-100 damage, will deal high damage to enemies around, will oneshot rocks/trees but not structures.

Remember the energy charges quite a while on it's own unless you use goat milk but finally you have more incentive to get it. 

Willow

• Flame breath: Sip lighter fluid, blow into lighter's flame for fire breath, aoe burn.
• Controlled flame: Loot from enemies doesn't catch fire in willow's presence
• Extra stuffing: You can put some items in big Bernie.
• Feed Bernie nightmare fuel to force big form without insanity.
• Sleep with Bernie anywhere using it as pillow for straw roll effect or on big form Bernie for better effect.

Was also wondering if teleportation in game where wanda exists would be too much. Some way to make Willow to jump out of firepits as sort of teleport. Jump into big fire like burning trees, magma pools, max fuel campfire to emerge from one firepit you've aligned itself to like with meat effigy. 
Maybe also forced big bernie could help you a bit with work like pigman.

Wendy

• Abigail 3rd mode: Stays by Wendy attacking, positions for dodging.
• Sisturn turns petals to mourning glories like in uncompromising mode mod.
• Use glories on graves to summon follower ghosts which enemies prioritize over Abigail but not Wendy.
• Spending mourning glories to summon ghost players to her.
• Ghost players in her presence can attack but very weakly, like 20 damage per second. Can't attack if Wendy haven't hit any enemy in last 3 seconds.

Warly

• Honey crystals now affect rowing, tilling, planting and harvesting. (he needs those onions)
• His special pack having special slots for his portable cookware and spices so it can be truly worth to move around.

Wortox

• Soul limit increased by 10 don't tell me 30 is a lot, 20 is already a lot.
• For extra 10 souls open temporary portal like Wanda's rift watch so with new limit you could get the whole team anywhere.
• Soul will generate for every 20 hits. Could be useful during long bosses like toadstool when there's no minions summoned to get souls from like during, Dragonfly, Bee Queen or Fuelweaver fights. Wigfrid already can make others heal 1 hp per hit. 
• Spend a few souls to revive a player.
• Offer souls to reduce other player's health penalty

Webber

Training/mutating with spider cookies the warrior/dangler spiders into bigger mount that doesn't move any faster than webber but can use it's leap attack to dodge. 

Wolfgang

Gonna make separate post about adding forge hammer leap attack to his kit in place of the magic dumbells.

 

Wigfrid, Wanda and Maxwell are already packed full, good luck with them Klei.