In 5e, if they took their first level as Paladin, they would gain Heavy Armor Proficiency. Having proficiency in heavy armor would allow a normal Lockadin to cast their Warlock spells in armor just fine. They also both heavily favor Charisma, and if the Warlock took Pact of the Blade or Hexblade, they wouldn’t even need strength for melee.
That’s a normal Paladin/Warlock though, with this weird hotseat play they want to do, their self-imposed rules might not let them even use the other class’ passive features, which could get awkward.
In 5e, if they took their first level as Paladin, they would gain Heavy Armor Proficiency. Having proficiency in heavy armor would allow a normal Lockadin to cast their Warlock spells in armor just fine. They also both heavily favor Charisma, and if the Warlock took Pact of the Blade or Hexblade, they wouldn’t even need strength for melee.
That’s a normal Paladin/Warlock though, with this weird hotseat play they want to do, their self-imposed rules might not let them even use the other class’ passive features, which could get awkward.