5. Orko (Masters Of The Universe)
Orko would make for a very interesting and very humorous companion for the Doctor. Orko is friendly, helpful and resourceful - if not a little accident prone. His magic abilities and his hat (an apparently very useful bag of holding, which is full of useful tools and trinkets) could come in very handy for the good Doctor. The interactions between the two characters could be extremely interesting and very funny, and it would be nice to see the Doctor helping him return to Trolla (his home dimension) - and somewhere he has visited occasionally - on a more regular basis to see his friends and family.