Sir Daniel & Colonel Radec
Both are army leaders
MediEvil was created by Cambridge, who also developed Killzone for the Vita
Sweet Tooth vs Kratos
Both die at the end of their last games
You mean by Timeline or by games? Cause there is a new God of War coming in 2013 in which has Kratos alive with Sweet Tooth unknown (but can be assumed by people) after TM 2012, so with games, that isn't correct.
If you mean by Timeline, then you're right about Kratos but now it's the other way around since the only Timeline TM had was TM1/TM2/TM:Head-On with the others TM3, TM4, and TM 2012 being in its own different Timeline with TM:Black taking place in Sweet Tooth's mind.
You're right about serial killers, killed families, and are both by David Jaffe. Though this is a first when someone mentions they both died at the end. In which Sweet Tooth is actually not deceased cause there's really no Timeline while for God of War, the games still continues for him with prequels.
The both dead would make sense for Sir Daniel Fortesque & Colonel Mael Radec as Sir Daniel dies at the beginning in the game he debuts & Radec dies at the end of KZ2 in the game he debuts. Both deceased (Sir Daniel as his Human self but not his skeleton form).
marcus kane dies but the Sweet Tooth spirit lives in the mask.. so yes and no. besides sweet tooth left his son alive to carry on the legacy and his daughter escaped in his intro and sweet tooth went after her. calypso granted his wish to be where she is and calypso put him in her coffin because she had taken her own life. calypso later revives her using a sweet tooth ish mask he created so she can kill for him.