I went through a weird phase. When I first played fe8 20 years ago I loved prepromotes. I used Seth, Innes, Duessel, Saleh just because I thought they were cool. In Fe7 I loved Marcus, Harken, Geitz, and Karel. Hell, Titania id my favorote character in fe9. Then I got into the old tired mindset of "Prepromotes are bad they steal exp". So I stopped using them. Now I use them again because I don't feel like training growth units.