I totally went with LordKnightmon/Crusadermon as a bodyguard for one reason and one reason only:
It's the only Mega on the list. Plenty of good cases for the other Knight Digimon, though, but I'm sticking with the strongest - flamboyant armor and strict sense of "justice" be damned.
Err the reason is why I posted specifically about Craniummon because I kinda thought Craniummon suits Knightmon's evo better due to everything about him is 100% Knight.
Craniummon have very Knight-like points:
Scary Knight appearance but honorable person
Only loves to challenge one-on-one duel like a knight duel
Strict Devotion to his "Master"/Mission for his duty
I suspect if he were human, he would be very old man with heavy scars who laughs off loud after battle with large beer.
So.. I didn't know why it kinda came off as it's natural for Gladimon/Knightmon's evo since when... I guess it must be my headcanon for that Craniummon being Knightmon's evo since he isn't included here...
I know this is about Knightmon but it's really weird to include "Corrupted" version of SkullKnightmon and DarkKnightmon if this asks for a bodyguard... Are they awake of those types to backstab rather than protect?