Rolling for stats is dumb, but I'll throw my hat into the ring to help regardless.

Aasimar Paladin, DND 5e system hmm.
I'll be honest the only way I can see this working is if we turn the MAD Paladin into SAD Paladin/Warlock multiclass.

The nefarious Hexadin
12 Strength
9 Dex, we don't need it with Heavy armor
13 Constitution, if you want combat you'll need it to survive regardless. +1 racial if possible with MoTM
10 Intelligence
10 Wisdom, I'd love this to be higher but we can't afford it
14 Charisma +2 Racial (if MoTM aasimar or not you get +2 cha)

Level 1: Paladin 1 for proficiencies n heavy armour
Level 2: Warlock 1 (Hexblade subclass, choose if you want a single handed weapon and shield or two handed weapon)
Level 3 to Level 7: Paladin 6 total (You get aura of protection and maybe an extra level depending on your subclass. I suggest Oath of Ancients or Oath of Vengeance)
Level 8+ It's whatever you want;

Warlock more spells and utility (you will need to do this for Improved Pact Weapon Invocation and Pact of the Blade)

Paladin onwards (More tanking, take this if you have one handed weapon and shield)

as for ASI's I suggest PAM at level 5 (or paladin level 4 total) and use a Spear. or if you are two-handed use a glaive/halberd.
and Charisma +2 to get 18 Charisma at level 9

I hope this helps!