Arbalest marksmen could work. I'm not sure if making a sentinel marksman would be too overpowered. 3 attacks? I know the watcher of Karna had 3 but they were only F5 and they're not invisible or able to cause terror so they would have to be terribly expensive.
Corsair Arbalest marksman: 45pts.
F S D A W C M W F
5/4+ 4 4 2 2 4 1 0 0
Wargear:
Carries a hand weapon, a crossbow, and a pavise.
Pavise: If a corsair arbalest marksman is not in engaged in combat, he recieves +3 defence.
Special rules:
Expert shot.
Dwarf ranger Marksman: 55pts.
F S D A W C M W F
5/3+ 4 6 2 2 5 1 0 0
Wargear:
Dwarf ranger carries a dwarf bow and an axe (hand weapon). At the additional cost, he may have the following:
exchange axe for two-handed axe Free
throwing axes 10pts.
Special rules:
Expert shot.
Wood elf sentinel marksman: 95pts.(yup, told you he'd be expensive.)
F S D A W C M W F
6/3+ 4 4 3 2 6 1 0 0
Wargear:
Carries a dagger (hand weapon) and an elf bow.
Special rules:
Enchanting song.
Expert shot.
Beorn (human): 155pts.
F S D A W C M W F
6/- 6 7 3 3 7 3 6 3
Wargear:
Beorn carries a large axe (counts as elven blade) in human form and has claws (counts as hand weapon) in bear form.
Special rules:
Terror:
Shape shifter: Beorn is not always in human form and when it is required of him, he can change form into a huge ferocious bear. To represent this, for an additional 25pts., replace the human form with his bear form. In addition, he has +1 fight value, strength, and defence.
Woodland creature.