Since I have two fire types in my team I am thinking of ditching Bleziken and get another Pokemon, however I am really undecided so I request some help.

My current teams is:
Chesnaught
Charizard
Gyrados
Raichu
Alakazam
Blaziken

An my major contenders to replace Blaziken are:
>Umbreon
Always liked the design but never had it, also never had a dark type in my team.
>Lucario
Looks neat but dunno if I really need another fighting type in my team, also everyone and their mothers seem to have one.
>Gengar
Never had this fucker till I received a haunter through wonder thread today, kind of interested
>Scyther/Scizor
Still haven't found them in game but yeah they might be a neat replacement choice

Also other suggestions are welcome