Varies some I have a high tendency to uses like the Jagen types especially ones like Tiantina,Fredrick ect... other examples of note is I used Minerva in Shadow dragon as she was of the select few characters in the game that had ANY development... oh and Shinon... there is always Shinon...
In this game, I use them because they're as good as everyone else. Frederick gets an early Second Seal to keep him on par, but Libra doesn't because his stats are better.
In previous games, I only used some of the better ones: Pent, Louise, Hawkeye, sometimes Karel, Archsage Athos, maybe Duessel, Saleh, Syrene, Innes, Stefan and Tauroneo on occasion, and most of the cast in RD started off in their second or third tier classes, so they count.
Kissed-by-fire Emblem: You know nothing, Prince Chrom.
Just depends. Typically I don't but if I really like the character I will. The problem I experience is that I typically get the prepromotes late enough in the game that I've already chosen my party. At least for the first play through.
FE6 - Can't remember anyone in particular. FE7 - Harken, Pent. FE8 - Seth. FE9 - Titania, Tanith. FE10 - If you count 3rd tier as prepromote, then Elincia, otherwise too many from 2nd tier. FE11 - Sedgar, Wolf. FE12 - Sirius. FE13 - Second seals make everyone viable.
Anticipating: Ace Attorney 5. Playing: DeSu OC, FE Waifu Awakening, FE PoR & RD.