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Okay, so I have been able to find a definitive answer!

Naruto Narutimate Hero 3: Finally a Clash! Jonin VS Genin!! Indescriminate Grand Melee Tournament Meeting!!

is the longest titled anime with a large 107 characters or 87 characters without non-alphanumeric characters

Second Place goes to:

Digimon Adventure 02: Zenpen Digimon Hurricane Jouriku!! - Kouhen Chouzetsu Shinka!! Ougon no Digimental

With 104 characters, 85 alphanumeric

And Third,

Dragon Ball Z Special: Tatta Hitori no Saishuu Kessen - Freezer ni Idonda Z Sens hi Son Gokuu no Chichi

102 characters, 82 without.

I discovered this by writing a small Python script to iterate through a dump of AniDB's database of anime titles and check each one, which you can find on their site

If anyone is interested, you can find the script here: https://gist.github.com/ianfhunter/43599d30384b9b7aa0c6 (but I only hacked it up in 5 minutes, so it's nothing special)

(The shortest is C)

Okay, so I have been able to find a definitive answer!

Naruto Narutimate Hero 3: Finally a Clash! Jonin VS Genin!! Indescriminate Grand Melee Tournament Meeting!!

is the longest titled anime with a large 107 characters or 87 characters without non-alphanumeric characters

Second Place goes to:

Digimon Adventure 02: Zenpen Digimon Hurricane Jouriku!! - Kouhen Chouzetsu Shinka!! Ougon no Digimental

With 104 characters, 85 alphanumeric

And Third,

Dragon Ball Z Special: Tatta Hitori no Saishuu Kessen - Freezer ni Idonda Z Senshi Son Gokuu no Chichi

102 characters, 82 without.

I discovered this by writing a small Python script to iterate through a dump of AniDB's database of anime titles and check each one, which you can find on their site

If anyone is interested, you can find the script here: https://gist.github.com/ianfhunter/43599d30384b9b7aa0c6 (but I only hacked it up in 5 minutes, so it's nothing special)

(The shortest is C)

Okay, so I have been able to find a definitive answer!

Naruto Narutimate Hero 3: Finally a Clash! Jonin VS Genin!! Indescriminate Gran d Melee Tournament Meeting!!

is the longest titled anime with a large 107 characters or 87 characters without non-alphanumeric characters

Second Place goes to:

Digimon Adventure 02: Zenpen Digimon Hurricane Jouriku!! - Kouhen Chouzetsu Shinka!! Ougon no Digimental

With 104 characters, 85 alphanumeric

And Third,

Dragon Ball Z Special: Tatta Hitori no Saishuu Kessen - Freezer ni Idonda Z Sens hi Son Gokuu no Chichi

102 characters, 82 without.

I discovered this by writing a small Python script to iterate through a dump of AniDB's database of anime titles and check each one, which you can find on their site

If anyone is interested, you can find the script here: https://gist.github.com/ianfhunter/43599d30384b9b7aa0c6 (but I only hacked it up in 5 minutes, so it's nothing special)

(The shortest is C)

Okay, so I have been able to find a definitive answer!

Naruto Narutimate Hero 3: Finally a Clash! Jonin VS Genin!! Indescriminate Grand Melee Tournament Meeting!!

is the longest titled anime with a large 107 characters or 87 characters without non-alphanumeric characters

Second Place goes to:

Digimon Adventure 02: Zenpen Digimon Hurricane Jouriku!! - Kouhen Chouzetsu Shinka!! Ougon no Digimental

With 104 characters, 85 alphanumeric

And Third,

Dragon Ball Z Special: Tatta Hitori no Saishuu Kessen - Freezer ni Idonda Z Sens hi Son Gokuu no Chichi

102 characters, 82 without.

I discovered this by writing a small Python script to iterate through a dump of AniDB's database of anime titles and check each one, which you can find on their site

If anyone is interested, you can find the script here: https://gist.github.com/ianfhunter/43599d30384b9b7aa0c6 (but I only hacked it up in 5 minutes, so it's nothing special)

(The shortest is C)

Okay, so I have been able to find a definitive answer!

Naruto Narutimate Hero 3: Finally a Clash! Jonin VS Genin!! Indescriminate Gran d Melee Tournament Meeting!!

is the longest titled anime with a large 107 characters or 87 characters without non-alphanumeric characters

Second Place goes to:

Digimon Adventure 02: Zenpen Digimon Hurricane Jouriku!! - Kouhen Chouzetsu Shinka!! Ougon no Digimental

With 104 characters, 85 alphanumeric

And Third,

Dragon Ball Z Special: Tatta Hitori no Saishuu Kessen - Freezer ni Idonda Z Sens hi Son Gokuu no Chichi

102 characters, 82 without.

I discovered this by writing a small Python script to iterate through a dump of AniDB's database of anime titles and check each one, which you can find on their site

If anyone is interested, you can find the script here: https://gist.github.com/ianfhunter/43599d30384b9b7aa0c6 (but I only hacked it up in 5 minutes, so it's nothing special)

Okay, so I have been able to find a definitive answer!

Naruto Narutimate Hero 3: Finally a Clash! Jonin VS Genin!! Indescriminate Gran d Melee Tournament Meeting!!

is the longest titled anime with a large 107 characters or 87 characters without non-alphanumeric characters

Second Place goes to:

Digimon Adventure 02: Zenpen Digimon Hurricane Jouriku!! - Kouhen Chouzetsu Shinka!! Ougon no Digimental

With 104 characters, 85 alphanumeric

And Third,

Dragon Ball Z Special: Tatta Hitori no Saishuu Kessen - Freezer ni Idonda Z Sens hi Son Gokuu no Chichi

102 characters, 82 without.

I discovered this by writing a small Python script to iterate through a dump of AniDB's database of anime titles and check each one, which you can find on their site

If anyone is interested, you can find the script here: https://gist.github.com/ianfhunter/43599d30384b9b7aa0c6 (but I only hacked it up in 5 minutes, so it's nothing special)

(The shortest is C)