Here's what I have so far:
Devil May Cry
Save slot 1 Easy mode
All Weapons
Devil Trigger Maxed
All Skills Maxed
999 Gold Orbs
Over 999,000 Red Orbs
Save Slot 2 Hard mode
All Weapons
Devil Trigger Maxed
All Skills Maxed
999 Gold Obs(I think so anyway)
Over 999,000 Red Orbs
Devil May Cry 2
Save Slot 1 Dante
All Normal Levels Unlocked
All Weapons Maxed
Devil Trigger Maxed
1 Costume unlocked
Over 999,000 Red Orbs
Most items maxed out
Save slot 1 Lucia
All Normal Levels Unlocked
All Weapons Maxed
Devil Trigger Maxed
All Amulets except for Chronoheart
1 Costume unlocked
Over 700,000 Red Orbs
Most items maxed out
Devil May Cry 3
Save slot 1 Easy Mode
All easy levels unlocked
All Weapons
All Styles
1 costume unlocked
These saves is for the US version. I don't know if they'll work for all regions. Thanks to Gold and Odd Future for their editors...