Here are some MHA-style names incorporating the provided elements, categorized for clarity:

Names incorporating "Lavender" and Darkness:

• Hero Names: Nightshade Lavender, Shadow Lavender, Obsidian Lavender, Dusk Lavender, Lavender Wraith, Lavender Umbra, Violet Shadow, Lavender Eclipse

• Villain Names: Lavender Nightshade, Dark Lavender, Venom Lavender, Lavender Gloom, Lavender Bane, Midnight Lavender, Obsidian Lavender, Lavender Reaper

Names based on Healing Quirk:

• Hero Names: Remedy, Salvation, Mend, Heal, Regenesis, Sanctuary, Aegis, Solace, Restoration, Life Weaver

• Villain Names: Anti-Life, Blight, Rot, Decay, Pestilence, Nemesis, Scourge, Corruption, Desolation

Names based on Memory Manipulation Quirk:

• Hero Names: Mnemosyne, Recall, Remembrance, Echo, Chronos, Past Tense, Retrospect, Insight, Oracle, Memory Keeper

• Villain Names: Oblivion, Amnesia, Forget, Erase, Phantom, Ghost, Illusion, Delusion, Nightmare, Mindbender

Names based on Fire Quirk:

• Hero Names: Inferno, Ember, Phoenix, Sunfire, Ignis, Flare, Cinder, Pyre, Blaze, Solaris

• Villain Names: Magma, Volcano, Scorch, Incinerate, Ashes, Emberstorm, Firestorm, Ragnarok, Hellfire, Pyromancer

Names combining elements:

• Hero Names: Lavender Phoenix, Nightshade Remedy, Ember Recall, Solace Umbra, Healing Eclipse, Memory Flare

• Villain Names: Lavender Bane, Oblivion Fire, Decaying Nightshade, Amnesia Inferno, Shadow Rot, Corruption Eclipse

Names considering both hero and villain potential:

• Lavender Ash
• Obsidian Mend
• Nightshade Recall
• Ember Gloom

This list provides a diverse range of options, allowing for selection based on the specific desired tone and character archetype. Remember to consider the overall story and character personality when making your final choice.