Ok since I am not drinking this evening I had to occupy my time, so here is a big list of simple changes to make Slow heroes more viable/worthwhile. Of course I would be deluded to think any of this would come true given…
“Will you consider to buff long forgotten Heroes such as boss wolf, g.owl, etc without needed to “buy” their Costume?”
- Tim: Buffing individual old Heroes is not impossible (and to be honest we’d love to revisit them a bit more often), but it’s also very low on the priority list.
…but WTH right, might as well imagine a world in which Slow heroes are respected 
ALBERICH (VANILLA)
• Increase resurrection amount to 38%
• Change healing to boosted healing
ALBERICH (COSTUME)
• Increase resurrection amount to 48%
AZLAR (VANILLA)
• Increase damage from 205 to 250%
• Increase DoT damage from 360 to 720
AZLAR (COSTUME)
• Increase base damage from 205% to 300%
• Increase conditional damage from 410% to 600%
BERTILA
• Increase damage from 290% to 350%
BOSS WOLF
• Effect 1 should be removed entirely (+24% mana generation) and instead be replaced with a “Increases the Mana of all Allies by +35%” effect
CAO CAO
• Damage should be increased to 325%
• Minion Health and Attack should be changed to 25% Health & 15% Attack
CAITLIN
• Base damage should be 220%
• Conditional damage maximum should be increased to 420%
CATHAL
• Special should be changed from 570% to target and instead be 570% to target and minor damage to nearby enemies
• Chance to bypass increased to 80% from 60%
CHAKKOSZROT
• 2nd effect dealing with mana generation and subsequent ailment should be dropped entirely
• Replace it with “All enemies receive -20 mana generation. This effect lasts for 3 turns.”
• Change duration of 3rd effect dealing with buffs to 3 turns
ELENA (VANILLA)
• Damage should be increased to 250%
• Counterattack should be applied to all allies, counterattack damage reduced from 125% to 115%, and duration dropped to 3 turns.
ELENA (COSTUME)
• Damage to all should be changed to target and nearby, damage increased from 172% to 300%
• Counterattack effect stays the same
GUARDIAN OWL
• Damage increased to 480%
• Instead of regenerating health over X turns, caster should receive 500 boosted health
HEIMDALL (VANILLA)
• Health boost increased from 500 to 600
• Chance of resurrection decreased from 20% to 10%, but revived heroes health increased from 30% to 75%
• Attack boost increased from 30% to 50% and duration reduced to 3 turns
HORGHALL (VANILLA)
• Damage increased to 330%
• Attack ailment reduced from 6 turns to 3 turns, but ailment is now uncleansable
HORGHALL (COSTUME)
• Damage increased to 300%
• Ailment changed from -54% attack to -54% defense down
ILMARINEN
• Mana reduction changed (from 40 and 20) to 60% to Ice and 40% to non-Ice enemies
ISARNIA (VANILLA)
• Damage increased to 330%
ISARNIA (COSTUME)
• Damage increased to 400%
• Defense down ailment removed, replaced with Frost DoT of 350 over 4 turns
JUSTICE (VANILLA)
• Blind changed from -40% accuracy to -60% accuracy
JUSTICE (COSTUME)
• Damage increase for each fallen ally increased from 50% to 100%
• Mana generation buff removed
KARNOV
• Add Poison DoT of 300 for 3 turns
KHAGAN (VANILLA)
• Remove Defense boost and replace with “The caster and nearby allies reduce all received damage by -50% for 5 turns.”
KHAGAN (COSTUME)
• Change direct damage from 514% to 720% on target
KUNCHEN
• Change healing from percentage to Boosted Health of 600 for all allies
• Change defense down for all enemies to “All Holy enemies get -68% defense for 4 turns.”
LADY OF THE LAKE (VANILLA)
• Increase minion health to 30%
LUGHAIDH
• All allies except the caster also receive a +64% to attack in addition to the defense boost
• Caster does not recover health while in Ghost Form
MARIE-THERESE (VANILLA & COSTUME)
• Zombie allies should have 800 Attack and 800 Defense
MIKI
• Target and nearby enemies changed to “All enemies get silenced for 3 turns.”
NOOR
• Passive changed from “Summons a Sparrow Minion for self” to “Summons a Sparrow Minion for self and nearby allies”
• Minion health and attack increased to 30% respectively
QUINTUS (VANILLA)
• Damaged increased to 450%
QUINTUS (COSTUME)
• Damage increased to 350%
• -34% to attack changed to -34% to defense
RAFFAELE
• Add additional effect of +10% mana generation for all allies for 4 turns
RIAN
• Base damage should be 220%
• Conditional damage maximum should be increased to 420%
SANTA CLAUSE (VANILLA & COSTUME)
• Damage increased from 150% to 200%
SENAN
• Add an effect to the Fiend, causing a -24% Defense to target until Fiend is removed
SNOW WHITE (VANILLA & COSTUME)
• Change first effect from “Dispels and cleanses all buffs and status ailments from all allies and enemies.” to
“Removes all buffs from enemies and randomly distribute them to allies, remove all status ailments from allies and randomly distribute them to enemies.”
THEOBALD
• Remove Nature Special Skill reflection and replace with “All allies reflect status ailments for 4 turns”
VISCARO
• Increase damage to 290%
VIVICA (VANILLA & COSTUME)
• Cleanse Ailments and Dispell Buffs moved to the first effect so as to occur first before heal
• Change Defense Boost for VANILLA VIVICA to “-50% damage reduction for all allies for 4 turns”
YUNAN (VANILLA)
• Increase direct damage to 260%
• Make Sand DoT 2 turns and uncleansable
YUNAN (COSTUME)
• Move status ailment cleanse to first effect to occur before other effects
• Increase direct damage to 270%
ZHUGE LIANG
• Increase Minion health to 30%
.